Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c4e90d554c6396…

MALICIOUS

PDF

97.4 KB Created: 2021-07-18 03:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3fd1ae4e995dbfd58827d56bb122a193 SHA-1: cb8b2177e92ab8f4755aaa2b0866f8f50b818156 SHA-256: b7c4e90d554c63967fa8b7c8da4428b61a5d5f2ad8bde8bd0a02b35f841756f5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The PDF structure itself is heavily obfuscated and contains no readable document body, indicating its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/916d9225ac1dd7d081154b2db3bba8c9/sagimitu.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/cc1ee1fa6aa2e19e12a181b155be6821/dovuku.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/zowobewivesufevewiwajafig.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/3626031099.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/93828401199.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/vibodusomubuv.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/37632736968.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210717/file/16265118854677.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607676c7aa8b1---lovadikoxedajoxaziletupex.pdfIn PDF document text
    • https://path.mn/userfiles/files/pixogiwafemamenireb.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/99258733578.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c54980be8d---75898762888.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nuderanujiliwimowekad.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160780f913757a---83793186091.pdfIn PDF document text
    • https://btegypt.com/file/47479292814.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae6cf2523---46299505280.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gotudikidosas.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bbdc49f73a726adcf2b3d5e35b1dcffe/dapapuxugipiv.pdfIn PDF document text
    • https://sapporopools.com/contents//files/90995775973.pdfIn PDF document text
    • http://platcometals.com/images/file/gobivo.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/pokefatazaros.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zejunarigudofeduja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=photo+etched+meaningPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a2ab6014e---guneridepumodesutozujasir.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011511.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11511 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 10504 bytes
SHA-256: e17e9f4bb67a4d609a4708d9c804a3fb2a8f67aa229bac64d8f7c9bf71d47267
font_03_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 22296 bytes
SHA-256: 00345037b5dae851119d7860400a569ce37e28c02f4a26c70deda92522b8fd42
font_04_sfnt_off00016a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A09 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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