Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeffb5b542071234…

MALICIOUS

PDF

89.0 KB Created: 2021-07-15 14:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 883f5ff75973ce73a7ce9c69feeb60dd SHA-1: 3a1cc621f4d464aed7e0eb8cbe94ec5757825f35 SHA-256: aeffb5b54207123492b8c8692617510a21290ba211dd83a6531337ac1c30e0fe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm implies exploitation of user trust to lead them to further malicious stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/tmdomc9iolumuq14najm8hpnie/retevenolijuzuluporel.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608092fdf1f08---razidebutegukunoniz.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63203615698.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/50751201222.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/80283953705.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/30365741220.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b32544bf---wugakoxapejexelanu.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/31155479642.pdfIn PDF document text
    • http://fullx.net/files/rikuseledolikubivivalon.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/59528063743.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/xexubimolaganagapexo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fl1ups52n86doo8u2fq3mmnu0d/bipujiguluwosiwadizu.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/27191785290.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/rojefutazirokibed.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/484365897006185eb6fefafc138299e3/37587514767.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/nizoj.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rifaletadalilelexubav.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/94135782051.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56e546170---55589414289.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/14377701501.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160792d9c35628---nonef.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/aelgb197608o361oo29qg4u131/posutufisezosoxunurim.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c785e304eb---93636022391.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3feb3122b---90335269390.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/l8hhojrc77hv0ll2t77mq2g9q5/87869039954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=amy+sherrill+duncanPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 17652 bytes
SHA-256: 35dff44e9128bc793a1614033b411b93c9c76784d91d6594736abaaba3aebb9b
font_02_sfnt_off00013f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F27 10612 bytes
SHA-256: 7132e61d5d05ce35f2080b39911914361c31d1863d43fdd9ef1d672ef7894286