Malicious PDF — malware analysis report

Static analysis result for SHA-256 716337c3fa598a07…

MALICIOUS

PDF

86.7 KB Created: 2021-07-18 07:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 78e9db165a9855db5f9fa9210edfc657 SHA-1: cb96e2c9e50361bbd01416d5e505310bc9fd7cf7 SHA-256: 716337c3fa598a07cd80dda89f8a3af38820ed4de8d0f0736c80dcb06c0bba42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDFs hosted on compromised websites, suggesting a phishing or malware distribution campaign. The presence of multiple links to potentially malicious PDF files on compromised CMS uploads is a strong indicator of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/0c75a6b5f40fdbc3a3ff36fc142fa2fd/kosuzitamigemas.pdf In PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbbf32b39c---8477257061.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aca47bb647a---nowusijasesiwagitikij.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/9163321790.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add76545ef5---79561059007.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/buvanenokir.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff2846b23---dejavaresozimeg.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qg8td2gidup3hv1qp483dbrvm5/noxigikemujigidunaw.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d642a551ad6---17723077774.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd91102c2---bofotu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bdc4233f---bidaf.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cb7fbf014---99914578785.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe9187bed---71982428227.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854155da480---34873042142.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf8f32870---rajowosazurejogus.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cfdb4dc2b---dotatelibojadusibagaj.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/62737611662.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/p2ujrr6qb9ui2q6tgargb6r37g/laridudozujikiwosifa.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/fuvuxunurin.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af978112cff---rujipigenuwixufatesofaw.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca446ed68---13606292331.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/31369444759.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/5hk83j6iq14m14ebc8625dtto0/61908594888.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8bd005a0cca167606e0a4627708cfc16/19077775240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=betting+odds+on+strictly+come+dancingPDF 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_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 10880 bytes
SHA-256: 7c4268f6329929f02b333d9f459dbbc8a2c4a45d2529c3f21668a32c7a1b92fe
font_02_sfnt_off00011e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 18096 bytes
SHA-256: 35deedb0d32bb6dfc87a2ee030fe6d7e624b8502936a22d29ea3ac15f127a153

Open this report in the interactive analyzer, or submit your own file for analysis.