Malicious PDF — malware analysis report

Static analysis result for SHA-256 c556b1fefdafbab9…

MALICIOUS

PDF

87.1 KB Created: 2021-07-14 03:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63a06ec3c6f3452786e03db36ea39ef7 SHA-1: f69913b483dd2cdff0400f9bf04f5ddbcf2b9d08 SHA-256: c556b1fefdafbab9c7e64980fc901573d0b1fbc8e98e45f7170850da6a127c44
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://slbreakingnews.com/ckfinder/userfiles/files/8539760092.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609421cb02176---76574594529.pdf
    • http://cuacuongiare.vn/upload/files/gukafazapomebe.pdf
    • http://inglewoodreunion.com/clients/68690/File/49139433672.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b7f01e526---fifinoxuxadedaroxanuduzi.pdf
    • http://jkohut.pl/file/1018803807.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5d4232be86b597bdd2a117d7a81c60ce/85808146048.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/si2f8ulqqahf1ghr5tv7r8iufe/monixi.pdf
    • https://belloverde.net/emailer/file/vunovon.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb82e15213---pogevavodepoxewinu.pdf
    • https://vildmarksjagt.dk/userfiles/file/jekupezotusutivob.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba750c2249---natokakepida.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/88527626224.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/60177196179.pdf
    • http://unipsyclinic.com/userfiles/file/20210621041748.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/8q0mrt2tcahskghb6fsvpgiqqc/53995905890.pdf
    • http://work4shop.cz/userfiles/file/83648329756.pdf
    • https://atraba-holding.com/userfiles/file/lutujodobilese.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=community+health+nursing+in+the+philippines+book+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f111.bin
9d82a94a849b6baa00812d3a30e298ba7d2f167fe6d47b0f975b16d82cb859a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16872 bytes
font_01_sfnt_off00011cbc.bin
139147f386959048c36d6e06fce0ef92fde575ed1e99d75f97306ea147533b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 11424 bytes
font_02_sfnt_off00013721.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13721 16792 bytes

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