Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b2e7e6f0faf78f…

MALICIOUS

PDF

125.9 KB Created: 2021-09-02 04:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd22a0db02edaef1b9bc722e69d674dc SHA-1: bb7e60509759e3dc65d12b928eb9d797aa069b50 SHA-256: e4b2e7e6f0faf78fc3cfb102347bc4fd0619bd27ad2463f0d5838275a91c2c38
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/72a881edb000bd142ef69c231ae80d9d/lizisad.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c274969eb3---vadiji.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/12139164822.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/4059563815.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e3464cb01---xetebebeme.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/45213643449.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5527a8bae---romorewo.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/86946226857.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/gimub.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/jofafitowovurubeveta.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/79376693391.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/30861742108.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///xewapovaligipozopuxanel.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/morofilawalu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/scr0m7fusgthbqr84th9ig5nc0/25181747661.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/43286457059.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/diniwaboxaxudigarituxowi.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/sukoxez.pdfIn PDF document text
    • https://coil.hk/upload/files/43794637640.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/21948591642.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/96164853269.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c079f234205---99754365649.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/321e7073e032aeb7d5a7c94d6110a436/joduwonevatoxedikazitu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0ngfdlfht8s34n0q0kcckt18de/96635853876.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/kelekuzuxegenorodedudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=henri+bergson+time+and+free+will+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210821/16295505243106.pdfIn PDF document text
    • 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_off00018a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A219 11056 bytes
SHA-256: 9b59e3d7647bc0f68288ce43074f531ac2181ef7125f9550f7f0d0279c160297
font_02_sfnt_off0001bb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB6A 17600 bytes
SHA-256: 7fbee6707fa61cd9607aea1eecfb32689c02685a473aaef4874f3c0593d8054d

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