Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b72230e0466a6f7…

MALICIOUS

PDF

88.3 KB Created: 2021-06-23 05:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec34e2e6f090e0133abc3bacd2aebce0 SHA-1: 110a859d24b1900e389e68605a64d97c8c509ff1 SHA-256: 0b72230e0466a6f7c6bc9a92301805b96d4984018997c7af764f2eb9f48e3e7c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing campaign designed to trick users into downloading further malicious content. The document body, though heavily obfuscated, appears to be a lure related to document compression.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/85d04b1e1a3fb458869ad3587ae88002/xutogovogajiladi.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b2b51955ee4c163a9e43da312fa8b9d8/75873345992.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a610aa56f71---95563700622.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7dc6c22d1d716a5c099fee80763c35cf/29909141477.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06a8207db---buvinutavafufupomeb.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d0151441ae7d7f7ad301112217db5c77/58730992841.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/loxubuxutipizowesefi.pdf
    • http://ipceurope.com/assets/file/10997316695.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff20800b8---vamedelokujogosaripez.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080780b5d3f6---38799629852.pdf
    • http://www.predia.cz/userfiles/file/povofopikijajuti.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98755bf740---zofejafojugowe.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab328513a94---78253012867.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f2a7fb4be58a2899afb03e628ad16580/werimutisib.pdf
    • https://pjkconstruction.ca/images/file/4913399197.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f621ab77359ab943784007469aec7a69/xerupazo.pdf
    • http://www.fotolia.co
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+compress+a+pdf+document+size
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ba6.bin
0d9bd232992a3639241246d614602e1e919b37b6a0d9a4684b9f9602c6b15c50
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 5372 bytes
font_01_sfnt_off00012ded.bin
f3c8f4217ee0b096b947a77dcff768a68ff725da3af1645765874a4b32fb73e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 11280 bytes