Malicious PDF — malware analysis report

Static analysis result for SHA-256 357e8ff4eb21c8a5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 05:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ecd28807bb6167c34b137920a3124f8 SHA-1: a5b0a5b0bf013e1766e4e4a0453a4110ae4b7ae0 SHA-256: 357e8ff4eb21c8a539e8450101203f54fdc05dfeca075c031219a5413e58c8bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://inbeeldt.nl/userfiles/file/puditafemezosopidatoz.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3297d8addd411c4b4d3d5b0e10edb6e2/39731461766.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/djmtmk2a747gr5ssqhlbbq44n6/6714110089.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/59638203501.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/8ec889ac054abdb5eb1f21a2c905b376/mitivosakefare.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/powajilujokerixaba.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/xetakis.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e23adb958e---88638377926.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/lesexedinivobu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c85191fad---90359986248.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/wujapup.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ae0d4292---98391627473.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/vemunef.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/fusulararivupebas.pdfIn PDF document text
    • https://keongracun.org/contents/files/76466844657.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/82460342197.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0d6825000f0c44c4de2155c1a4c3f731/mivepawivomutozu.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/69212843927.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/gufebel.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/68284581111.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/61712565382.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd97b7577---79217771290.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/mewabokazobukatotutop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tendou+live+wallpaperPDF 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_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 10332 bytes
SHA-256: 10978e101516c67d1ae0049b976197ca0ea3ee08b18a1728742c939535d3d37e
font_01_sfnt_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 18008 bytes
SHA-256: 87ccf094eb56d0cd315dcbb869621781bc4a4b24323778e7673f0c8cd51e84a7

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