Malicious PDF — malware analysis report

Static analysis result for SHA-256 178b4206af765496…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 18:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f85c084284207514cf7e52e80d9d7e00 SHA-1: 76e5578f7f2296336e3beea2d97a4f9cf2df7b1c SHA-256: 178b4206af765496f0f6cc0e19a0ae20b5ed4180f193152f2345ea08f41f3fa1
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on various domains, suggesting it's part of a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or tech-support scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://balmybnb.com/t/tutorfirm/uploads/ck/files/2477752169.pdf In PDF document text
    • http://vitacanes.com/uploads/files/wexexanowolejavul.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/wuwerulipelil.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109070255576873.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/dojonenalejosetupir.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/dezibigapotukugaposumukos.pdfIn PDF document text
    • https://heyratacademy.ir/file/rolozidi.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/99526005001.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/37713826647.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/19o04cfcfgchhsqmkq2ag5vnfr/wazaduxuje.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/20954209519.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/72338937670.pdfIn PDF document text
    • http://dhf-china.com/d/files/maborodub.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/dudatufanalivasuzi.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/serawezarutufatobag.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/60610054524.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/79597379555.pdfIn PDF document text
    • https://geniodelweb.com/file/fitifebedotilebote.pdfIn PDF document text
    • http://belv.ru/userfiles/file/disipujubajitujozodinita.pdfIn PDF document text
    • http://premo.at/userfiles/file/fulukebededaper.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/mezigi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135992909266---xerafuju.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/58230442899.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245abcfca1---12463566.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161379944ec8a1---komuxafo.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/rofeti.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/5639671437.pdfIn PDF document text
    • https://www.ediliziaindustriIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+connect+to+a+locked+wifi+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BA 17780 bytes
SHA-256: bd5c8da4026834b7daf13d423a1ace44a309a330cad8881c0dd5dca128dba885
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 10472 bytes
SHA-256: 7e0c61ac958e6c4bce2181ae7d17d65249534a44a79f51338b660d2ba6883181

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