Malicious PDF — malware analysis report

Static analysis result for SHA-256 8935461384ce042a…

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 15:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35f7b3dd936c440842406e236812318a SHA-1: 1f8179b403fadca79ed5d5a9d3ab506aa26588db SHA-256: 8935461384ce042a9e89536b3c7597c94eef7828125cecee008ce69a8de60aba
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The document body is heavily obfuscated and appears to be non-readable content, suggesting its primary purpose is to host these malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://growlink.biz/userfiles/file/15472581358.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774d62791e---73420642671.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fa2ec6ebee14f2a8eb56e7515a362a29/20891812994.pdf
    • https://bajrahrs.com/userfiles/file/tekivakiwegutagafeke.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b5d1a117963a48cf779b526c0d990cde/jiboli.pdf
    • https://footballsod.com/images/ck-uploads/files/7003356565.pdf
    • https://poolpoint.be/uploads/file/fapekarakabikakukil.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/53a13b06de0191ce9b40f7f84351d05a/14210814297.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb18e1192---95584292098.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ecf430580---40370135203.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/dqfrdsd5rq08cq1vvebs9kvpph/nakogodirupaxavosumu.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6e2363e361b5730128931e8c88214284/63586846249.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160863092646ec---83130480698.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af6e34f97---3744332469.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qim9g8l6i71sl561s9qhn5dmle/subamuwuxemisade.pdf
    • http://dd-eng.com/files/files/24334651205.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f10c58328c---74364224680.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/67265398269.pdf
    • http://domholidays.com/userfiles/file/38362851191.pdf
    • https://vegas-shop.net/uploads/files/74507627349.pdf
    • http://allasclub.com/campannas/file/80496996354.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=we+will+worship+you+in+spirit+and+truth
    • 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_off0000f2d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 16792 bytes
font_01_sfnt_off00010ae8.bin
adbdf6c039e206540f6908041994cb6be6a46a679670a014b113d765e59fb4fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 18036 bytes
font_02_sfnt_off000139f6.bin
c7431b403c4081284b4b39ce1646746536ab944644fd4cda399500eeb7385cab
pdf-font-stream PDF embedded font (sfnt) at offset 0x139F6 10784 bytes