Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcb9fe5f2b04ed5…

MALICIOUS

PDF

134.5 KB Created: 2021-07-23 04:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ce0379495d9d17417eb9dd85e8fd859 SHA-1: 6103f853f5358b378b242011afea9001bbf60fe9 SHA-256: 7dcb9fe5f2b04ed5255f02d461049a038d2052d6d59a4753b4e3ddff45e92280
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate this file is likely part of a phishing campaign or used to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/285509c45b99b6fba087615c97707d93/vowadozekodiwegitonusasif.pdf In PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/43802436549.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b6f9a5b7c4fa5f6843907afbc2a236e9/niwawukofegilumisate.pdfIn PDF document text
    • http://arslanemlak.come/file/93022055625.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/zubefin.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/79156222004.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/b8ec142k58rv0ajif2r77jf3f3/finadaguka.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/kijefanamuk.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/95800597208.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e7fbf3b3ed1f4bf030f89a31a90a8de4/9310864439.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b789db596d---bepewuzajojepazul.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/pileforerebatolanok.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5d55e8fc9---88973191610.pdfIn PDF document text
    • http://poiskvod.ru/images/file/mawepedupifipo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edbb6362f1b---panun.pdfIn PDF document text
    • https://emmaushuis.org/pages/17640914344.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/nae08ogbg3mm3j916qhp9c3f0d/14420251684.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/45297f346cb3ed5ee42d4593b03ad740/95261103709.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b7b78d227de24f552dfef631b9d2e9aa/rarajuweboni.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/peserituzefawijadefugijod.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b0b364e8662372d014e9964dd6e631de/sodefemupogapojefu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/c00smgi399jpmpcshujbd5li4d/97272833210.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/92023417840fce10dd61382cea723487/96371331403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=describe+the+enzyme+substrate+complexPDF 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_off0001a529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A529 11156 bytes
SHA-256: 09aed2fdeb9208d0aefe1e0a7f07c417349694e214313316c9c8c854658d91f8
font_01_sfnt_off0001bef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEF0 20236 bytes
SHA-256: 2f5bd5b94b1ac84699500b2920c375053d07ee1833564c220927f0a33f1e67de
font_02_sfnt_off0001f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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