Malicious PDF — malware analysis report

Static analysis result for SHA-256 af418a255e0a1105…

MALICIOUS

PDF

74.9 KB Created: 2021-06-27 16:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c9b10f768ca8ae95d33eb11b27d1167 SHA-1: 0eb0398364a14b87246e309486b9ee7b69c5b468 SHA-256: af418a255e0a1105bcfaadad2e4250a98de9d5d650ff755b4d47ba4ac761b415
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF_URI heuristic further support the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=conway%27s+game+of+life+c+program
    • http://goldway.jp/upload/board/file/dosorisafidesex.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f39f221c178ed3422e275c31211546ee/4181239050.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1e05cbfaa8cb1b3210510d409e37ab87/wururizaxu.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5tphcoubi38ul35ubtea1g5c15/21946984577.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/28653416108.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/q5tbcll782gnpcq08896lrr5c7/50433044783.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/37128677040.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607169ff79c0a---47077881518.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/sazozizixib.pdf
    • http://alexhofford.com/temp/files/file/xurimuwemaxijin.pdf
    • http://scard.vn/app/webroot/uploads/files/bopep.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa775cbc8---7920610889.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a8e09c93---xupurowukexire.pdf
    • https://mwasafat.com/uploads/files/93329719938.pdf
    • https://red-adlay.com/upload/files/89203612438.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3633c52ea---biseriwomit.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2a53ae788a39ba076134cf592c21a072/nupufozexokopobusapi.pdf
    • http://profesniprukaz.cz/ckfinder/userfiles/files/42432195959.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607d701d68df4---8199082834.pdf
    • https://partnyor.az/userfiles/file/dufebiguwe.pdf
    • http://x04ydivan.ru/userfiles/file/luvatekanagiw.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_off0000c359.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC359 16792 bytes
font_01_sfnt_off0000db70.bin
c782a89c00598fe25764185761df26289760208b859a59db513bdbd0c815e10e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 10988 bytes
font_02_sfnt_off0000f511.bin
aba3b45a24afeb55fc558304b3e3bc76c7c5f2142a215de6a8c6ee9389a2e2eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 16008 bytes