Malicious PDF — malware analysis report

Static analysis result for SHA-256 a406e7a58c37023e…

MALICIOUS

PDF

96.1 KB Created: 2021-07-29 17:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 651981bf2ec89893ca3e086606e5efec SHA-1: 3558ace520ad95c16f90d60a0a62828e51e5355e SHA-256: a406e7a58c37023eb20c872bf779c9b0279253cf23686058da961268b76305d0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=telecharger+livre+pour+apprendre+l%27anglais+pdf PDF link annotation
    • http://agcslohian.com/userfiles/file/ruwaladulezekepewiro.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1psjp3amn63gijec0vo45r52r6/vuxevix.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607464a893352---17141540080.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/63b13830c2f1b5238a20aa46435783ca/10810092182.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/73423417368.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/05563793d318f0130e311cbea7fef5c6/82450352966.pdfIn PDF document text
    • http://goref.ru/files/file/63650475844.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/72992641928.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/99452695214.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/29072958361.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/topagakapoxeganafate.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b4f425536606b73bd0dd3848e8e60d58/bewaxevegudosinujejaf.pdfIn PDF document text
    • http://centronegozi.com/public/94041298427.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741ad871943---14655822349.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd36f8cb47---xafujefilagil.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/zuduzizapoped.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021062109470316.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088e2d9087c3---31739197025.pdfIn PDF document text
    • http://kalikraft.com/images/file/gufupe.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5c7aa64af8a0f073b0be58ee3d06811d/21055407046.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/muwenapigutuvibipometo.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/26/file/vodimujavajiwapigowulopip.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/68669667832.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/eddebujr2bfl8a6l5opii9ph1n/tawaxaziroxexuxobugiwag.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/76102093181.pdfIn PDF document text
    • 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_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 21900 bytes
SHA-256: 99c46ec781ffa3fbd1da05cd3da600d340a096934ed45b2d96de0917c24060b9
font_02_sfnt_off000155cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CD 10964 bytes
SHA-256: 748b9502da32502d3a7b01f56ce80fd14c2402e523f7c7df0762ec7034720f49

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