Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cb2b573d25d4b5…

MALICIOUS

PDF

57.3 KB Created: 2021-07-03 12:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39914a458c48a91cf3bf077b9b90eee2 SHA-1: 2fb2d4f5f0452c465a0a9c81f8fa940d8fb0a50e SHA-256: 80cb2b573d25d4b58c562a3975a7c7684943d315b8abf28c5b3db42a0739a1d5
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5173

Heuristics 5

  • 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
  • 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=smugglers+cove+by+marston%27s+inns PDF link annotation
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/9989753d99f20ed7e11bb9760fbc23bb/25373333281.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/90757fc2c7f92301d53bb5ae6a64b460/zokinujuraxenep.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/98731315257.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b703ec53bf0---59056621777.pdfIn PDF document text
    • http://www.celso.org/download/sivenesosezomugevolodot.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac00216d1b---sanamexidamuzibe.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c96523cb4---64880315110.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5099860053f0dd00dfaa9538e6e7cec1/rimasikuvanamidude.pdfIn PDF document text
    • https://sambelteri.com/contents//files/36461011092.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/nuzizusebosowebigekumuru.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/64752ebf294113e0b0fba5f0f8cd270b/kibifomedivak.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7209f286---62002568335.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b881f187c31---laweguliponuxuvolomogamo.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/xetagubozirisanugavu.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/57932453711.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/85197203448.pdfIn PDF document text
    • http://abnicum.ru/files/file/68723099332.pdfIn PDF document text
    • http://webursitet.org/Files/file/rupidagetotogusujorojuju.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a480de2f4acdf977052837f608195102/wubububu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/3a75c94ff5af6d3468b605fa6e61fc34/72185919725.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5bu043o30dqrb6bd7o5n41nvkg/mudexuzasasodi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbfb98950b---woworusa.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1533e8099c---17945994194.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ltjs8cd4m9nb3l9l6mvic7ji3j/30593174365.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/cu8i072c6d87mc4jsout2uv85v/xufofesudabumexos.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddb3b1832---39553091287.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1