Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3c6fa1bad1e300…

MALICIOUS

PDF

84.1 KB Created: 2021-09-22 09:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72ffa23acb48017ad84d7a2d996246cc SHA-1: 1bad97dc7e7ebfce9f8142c4b6a4be068bcb5fab SHA-256: ce3c6fa1bad1e300f87326c944c0d6cb8be2830de4771f00e158f857ca811bba
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://dobermanncz.eu/files/budawofavegema.pdf In PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/98226366011.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/25947063338.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/jopaxir.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/63352824030.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2cd6ca01fe93cbb9ddcc38da1bf354c2/gomeziwamib.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a5278c92c334ea828f3d60826d2d1a5a/levafavuzevizodigug.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/15888204394.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/xejorufaduzepikukobomib.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/saxedapepa.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/91745410395.pdfIn PDF document text
    • https://slide-bearing.com/d/files/17421358263.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4jd70tfduv2063s9bdie0h5ifp/sedewanoradutusuwi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/neqobgu5bi1jo29rdelhb870al/vomojenalegebedeladogeda.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/tedarubopetebenovezowek.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/26680642092.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/kovemozorariw.pdfIn PDF document text
    • http://kdekdyjak.cz/data/xivodifovanep.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/71069275528.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141530d26a1f---besiwivimizadususaxuguwaj.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092104122656.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148dcf1da010---5069744310.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/zixaguvop.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/26036828837.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/xozobozarogunafa.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba207a607c---zumitukafusixadewuz.pdfIn PDF document text
    • http://tcihk.com/userfiles/fejofigamoxere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+restore+android+tabletPDF 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_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 10456 bytes
SHA-256: 5fffc1ec9a103fccf6d84329a10981e01f1fdcac92f64db767ba38726b474d49
font_01_sfnt_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 17652 bytes
SHA-256: c3f8eba3a0b2fe4eb8f9c06d7a845452e9e735d9e0ea8725041967552f69d4d0
font_02_sfnt_off00012a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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