Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6f34b3ac265c7f…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 19:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 26c1f7c34c3ea52281e407fff15ed517 SHA-1: 40245beed50849cd5cad6075fdaa837e3e571e63 SHA-256: 6d6f34b3ac265c7f9906c4da0b3b2d78d0b0fb202d7db8e245166cf9e35dd810
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links on potentially compromised infrastructure increases the risk of users being directed to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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 http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160792072299b0---nofugekuxeruwi.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a6dbd72325ed89a239e666e510dbd8f2/40535186268.pdfIn PDF document text
    • https://proxus.nl/file/60590774718.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30569170069.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/79729808278.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/37996496624.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/52263634769.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/082f5393dcf1af38beca85ed0ff97bcc/31240504925.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076de4ee0a8e---19763604822.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe4727682e---fowawulufebudexupo.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/64020387019.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/sutituxakisotoponabin.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/pejeraxidimexasu.pdfIn PDF document text
    • http://chikatere.com/Upload/files/75560952393.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/sanivupadi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160847cacebd60---64912339524.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa979b57630---84619261995.pdfIn PDF document text
    • http://anpo.vn/upload/files/jovaseziv.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae54c661fc---ruzof.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ms8o15tf6avioaki7ma3fhk6m2/1451820392.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/afe8b18af2bb9cca88229e5258752d79/bukuwozatamud.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0b7a2258fa4a5d1dcff793d137350ae5/kulukimudukowa.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4de6d2f26---58268854865.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/caf714fa6dd2fcdc5b6d654d667fb00c/lidavevusoputapamu.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/12171471473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=planning+phase+of+curriculum+developmentPDF 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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 16512 bytes
SHA-256: c4ad3335af2b0932cd06317082bdc4b96443e9f6e4d9c46342f0bf1ee6deb10c
font_01_sfnt_off00011aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13301 11232 bytes
SHA-256: 60d3155887a9ee6f6da78e335637101938826be6f586390a1ba455a62d7bae49

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