Malicious PDF — malware analysis report

Static analysis result for SHA-256 3880cc16db57c79b…

MALICIOUS

PDF

111.0 KB Created: 2021-09-02 00:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5262a20f941fcc2082e5b1addb29d2f2 SHA-1: b1ba985f645e339a13591ae4cdf68013bbf7bbb6 SHA-256: 3880cc16db57c79b2cf6e91efacb7b5a8a744e80475e38025f478e59824bd1ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and unreadable, suggesting it serves primarily as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f80e9eec---pijatonador.pdf In PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/sonugijubivevaxegesowoxa.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/79629446014.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160839d1d5753c---totorizo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3487bcfe---wiwotarefujobaladifef.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0172caf2918e87e9396ec99f0f6baee/45808491275.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cde8acfa7b---gokokusudolaxogi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1e8ec7cd---jadiruvesawedupolowebixi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kezorurowo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/aalek6s89em9fkr0f9ncm2qsg6/45731964015.pdfIn PDF document text
    • http://learningkey.org/userfiles/61455964771.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2tj1m2acv77vomt1uqvh626ngu/kefusekevikogik.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c016c8812e0---30378272984.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/lerefidiwe.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28728693b3---jujeritokarapukojepu.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/cf8902e3c1a6ba9811854f9a7aba248b/1174819524.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/20266726756.pdfIn PDF document text
    • https://ahha.az/userfiles/file/51275227025.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16112bdc37b3c6---28074895662.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/bijatedetejofewevefop.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/92708882332.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/45154028407.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1a0404f21c0e4ea7f4274dfd41e3cef6/94861327342.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/93031852180.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/goqonlaedvo2amgeljptkp87e3/95709214061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=town+hall+11+base+best+defensePDF 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_off00014bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000163bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BD 19508 bytes
SHA-256: 1855e62f4a0902e496ecc6b832ba805785458603a7acc9f4c17bccd322ad8dbf
font_02_sfnt_off00019631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19631 10500 bytes
SHA-256: d6563bc339c3bab36068a0d66f35c271978707c1ee98cbd6128ffbdbcb85ae77

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