Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e737ae25278b4b9…

MALICIOUS

PDF

103.0 KB Created: 2021-07-19 12:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 92d0ec43a9b4dd8843c9adc445d66e09 SHA-1: e5608662257663e5ec44cfda27fb4ed3b7f54b06 SHA-256: 9e737ae25278b4b9aafdf2f6a6309b971207eeb224622ad5be9fb30d41adba58
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/14pkfg2op2ff1gh6f3sbdnr0r6/80603416561.pdf In PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/5623e9471cb9b2a45713debda4ba3de9/44115070155.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/38899920694.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/esb3kh4upvn0doahse8uknmslm/83056665533.pdfIn PDF document text
    • http://unseretochter.com/images/file/68947102534.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zifarijinigefezamemigi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf4be30002---22754499041.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7e8a07150aa34de8da25b62b5222bd87/gunakugimovozojajilusa.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/34123690723.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/pabisupisizogazej.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/2592155904.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/nixip.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e44b4c0a3c3---51314645853.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/bfd1dd52d4a1e5b37f079ea380454ee7/zatilage.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/50778bc2ea1b46265a8c7fd76568342d/4807063639.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38f619e1a---11160824418.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099ca508c07e---70917927258.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2387d521---63330323725.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c75d194784f5560cdd6969f63d7700f1/geluweg.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8626b6a893447702d4ab3f16513ef985/pasajibugamaxilazuvepet.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bcf492c3---watirarebisuzekezonemosif.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/xizadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=words+for+throughoutPDF 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_off00012e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 10192 bytes
SHA-256: 36efb14fce7aec27963cb553a87eb2e257c2bca8a6a12e17ffe1441cfbdb301d
font_01_sfnt_off000144fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0C 18384 bytes
SHA-256: b1ec7d31d39ba1ab8d877b384d1f4ad28d6a2844b801edb758e053ad643fc0df

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