Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc9bc5c3f71f9ad…

MALICIOUS

PDF

74.9 KB Created: 2021-07-15 19:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20a85ceba16a1a6b7b8e4b68fcbeb0d6 SHA-1: 394c7159c4881533ad1af0d6abcb7f5ece7e5b1e SHA-256: bdc9bc5c3f71f9adefea6df0fd5f319a6b112e32558d24c6a18cb5830b91990b
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7521

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/rkckqk3mm0qrqlel8qrpvump10/17732395096.pdf In PDF document text
    • http://amoy-art.com/Upload/file/sebujebebuxolinu.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4977a233b---tekewuzaxidibumokasis.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083072bb6325---nisokejegekitupala.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/koxakibokujoj.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/mupevesutewab.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d7ea6272a87b90de685ececdb382843e/sopomodejabiz.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/tatasoge.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890987939aa---tasujilibawepaxa.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/vexolalu.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/69217a4dd6356e49225bc5f4890997a3/31815765228.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/8be5dee8ecf8eace4ea02ee612da1958/dujevorixa.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kirafupetozasiduxazepu.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/14701067085.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087203798c6b---vowilemofiveki.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/kefufomosifimoxer.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e202ab2c9---zodevadolozuvaxiwiduxulu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hu7ube10pl4rcr1oamqf7mcqud/jubilagimufozu.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jebexuveralotategilen.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/galetixemumapusizivubu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609747bcb8db9---44204814144.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/dikukusutu.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/paviwemerewanodemaziredoz.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dfb7b677---47574119024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=extinct+species+meaningPDF link annotation
    • 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_off00010040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 16424 bytes
SHA-256: c741e6f5fa825a6807c42585922904197a542b9cb9cc6e5f9a1a9a72d2973d13

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