Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b5540f1621f492…

MALICIOUS

PDF

78.1 KB Created: 2021-08-01 06:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f4b12ecf39de6239252890baf3c6aed0 SHA-1: 1db5e82dfcb27c0b05197c0be3e20a7072f3b4d1 SHA-256: 13b5540f1621f4927e333f2cfd5212c74c5216a28b9cb771a2649b3cc24abc12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8319

Heuristics 5

  • 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
  • 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://biharlokmanch.org/userfiles/file/8220724630.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a07abd07075---50789655420.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609692255e3f9---9661477718.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa6252176---regik.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/81538984383.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/4l888jt3f4uqa564cfig399502/12957586991.pdfIn PDF document text
    • http://poorclarescork.ie/images/17940179718.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/padifexumelifir.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/j4aaf51bs5n9hblif9ha9ob7fg/kanuzuwujejepifamenepeve.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/88536395116.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/81813585593.pdfIn PDF document text
    • https://arerp.kr/data/file///72810813063.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/femon.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883c6b0064f---36789957890.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/92229893101.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/33677003581.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/64523606207.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/nuwos.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d8ed0c30---jizuvo.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/towevuw.pdfIn PDF document text
    • https://atl-50.com/files/file/88518107810.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/namumufiwil.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e93e489fd4a46707fe62d9d76602e243/64171839802.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/tubimidokedizivetapu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ccd2aca3---17065400924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=why+did+my+electric+hot+water+heater+stop+workingPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 18012 bytes
SHA-256: e6e69c207a16e6d1ae4824f6b32d42d208e39f8e3805ff172f39aaa31810acbc

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