Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afcdc87ef5b1fd2…

MALICIOUS

PDF

98.4 KB Created: 2021-07-13 23:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cea2de8e883d5eccf51cc36e51b0c724 SHA-1: e9876f9321e493a4eaefd6e0b5f05f84ec71a643 SHA-256: 6afcdc87ef5b1fd2a39a7e31c8155381a6df0f71fc4e262c942a5691ee4ea5cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with techniques used to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a09a1f8f---seluziko.pdf In PDF document text
    • http://ecandrychow.pl/Image/files/janozux.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9f072596fef195bd2969a93ebe221f4e/27091002966.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fce46b8cb---bebimafat.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/37410582966.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/daziravimelava.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ue5ocvlta55es6e2hg1bme5j06/pikexarumukup.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/56481511161.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/78770991097.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/64412211213.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/po8jf8sqogsk58nsrglmo1io8g/pusevudoro.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d86cacab7e---87722213053.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a68b22e3c---9515052716.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7ae9a40dc57464e089775fbf320bec00/52366177715.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hmigtaedej2t4oi4djej8la164/8249221003.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5dcf88e3da3b7e11a5cb29af075377b8/gijewuwuvoz.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/kf8tra5ul41ejv1btda3l6dsi6/kuwenumevunavajo.pdfIn PDF document text
    • https://elektrona.cz/files/file/60881539208.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a8e0b72e85395b3bd72adf5f9155a91d/fulisigeseximagumiwa.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9ebe7c2dcfaf8004513cc75947e485cc/36558972056.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1fdc8461917b181d4eb0e62bacee0510/kemepajap.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b551bd043a9---57890759424.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cecf5ba32b9---koxejegororexupuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+free+movie+apk+for+firestick+2020PDF 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_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FF 17220 bytes
SHA-256: 28db618057a3b59dcbf0cae5d58ec1c9cdf62d5d9cb9990d7ef03f85cd069672
font_02_sfnt_off000162f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F1 10944 bytes
SHA-256: 7b16109b61f0a6c1b3f8866ac259e1071456f48719a1f24e9647c2c8ffbc97fc

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