Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8dc53cc76e53e0…

MALICIOUS

PDF

90.0 KB Created: 2021-06-28 13:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 695d3ccd2f4d2f4baf29dd23c0047b0f SHA-1: 9d513a7b7f453858027af283deb3f32ebfc59ebc SHA-256: 2c8dc53cc76e53e0531b0ce6806865cf5518c47e58528176b19c732d142ccac4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://archism.ru/uplcv?utm_term=ultimate+husband+by+skykissing+wolf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7978c691b---48076057321.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bpg8b53l6q81f9f37q6hobpgtj/serabasulozekewolotokani.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c755397b3ad---99191088050.pdf
    • http://dragonera.cn/admin/userfiles/file/gesimimiwo.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a0abe08fa7d---42368679139.pdf
    • https://xn--80aaijzh9b.xn--90ae/documents/file/bafazawirazirepafifowobi.pdf
    • http://chapelguild.com/images/usr/71501363196.pdf
    • http://runningrhinelanderrabbitry.com/clients/875187/File/93298008198.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdf64dce5e---zurijelerikilet.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2e19e264e07e48dc36cbe8ffc35cc9e8/xamak.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc77d3051a---tonejazovo.pdf
    • http://bulk-supplies.com/userfiles/file/tigavobutixot.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160871cf354ebf---8934056597.pdf
    • http://unesco-mediain.cz/fckfiles/file/82555412717.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c32559c6e14---xotuj.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd557249b---65561562075.pdf
    • http://sakem.org/userfiles/files/28573721332.pdf
    • http://www.niziointerior.pl/upload/file/noluxa.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/salikifabadobuvawitizuga.pdf
    • http://aldara-latinoamerica.com/userfiles/file/xasuzawo.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907e54378c2---folagok.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8934b1bdb0---98541111815.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_off0000fa58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 16792 bytes
font_01_sfnt_off0001126f.bin
cd07c2141075f1c95fd70f4199bbc22a6cfb30c9cd07113be518fb8ad2cfcfa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 11240 bytes
font_02_sfnt_off00012c74.bin
5b0aa96d55b5871b934c0378c2031218b2612ed00853e43b770b3501fe5be1ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C74 17044 bytes