Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a7baadce3a649a…

MALICIOUS

PDF

88.8 KB Created: 2021-07-01 16:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 231fc0c974a5b435931b8fcf2a46a1bf SHA-1: 0242558a4678b1ad1eff57ed4ebc4938c00dbdd0 SHA-256: 33a7baadce3a649aa1b54c1d581b41a2e398b3db7ceeffb83ed7e3c290a1caef
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a browser extension installation lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://irlanc.ru/uplcv?utm_term=chrome+extension+new+tab PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d7e603f0---49198429650.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/847oscd5uvnmjp7jqdfih4tiqb/goterosotapijebakegonopu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088684b574bd---77141591565.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b020369628---49344043831.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/dukaledijolavebamixu.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/muxas.pdfIn PDF document text
    • http://prestopc.it/upload/file/mejoruke.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0d6c29779adafe29bfefd446234a9428/leven.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///75734850782.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9f48dc82---98047026141.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/28837759801.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/13646339553.pdfIn PDF document text
    • https://aspirans.com/files/file/zefuwagutobuvasiva.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bbdb6b04a---neroj.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/84588779684.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/kaviba.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ae1d691d0c27a5486222609493ec83e9/limaputigexavix.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1b80ce70709ed4118e813f314673068b/57539637329.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792dd1e9945---30411234966.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/pekebipazufitaked.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/rerixogakurexuberufem.pdfIn PDF document text
    • http://seritour.com/rsm/files/81636319025.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/banig.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/52377417577.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_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 16976 bytes
SHA-256: 0d4667381122b2c12ab24c21f74f0126e3658c5370394164af3ac95d0cbb5b72
font_01_sfnt_off00012599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB0 10688 bytes
SHA-256: f66f91fe38daf48d7510b84bf27a8be8927f1835076cef7919f680e187a4fee6

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