Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf832ff641991f7…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 03:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 549b99bb0491e3753fb2926d9ccc253b SHA-1: 7faf1868690848934df5f0c6a28e19f7d77d1190 SHA-256: 3cf832ff641991f73e5c43c4abe1415d5830b894a7be1909f1f1ee0947ddc6e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest it is designed to exploit user trust by appearing as a legitimate document while leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/01e879f19f76879f4e2d4193383c6d56/nerozosidigizedamemozudux.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2cc8880a9cf9a06731a63a394dc4034e/didekagiwadigujazenajes.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7d8f62a5950e795512b90840f12f2261/waxeduxabubemurofiwudix.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/dilusokali.pdfIn PDF document text
    • http://espwireless.net/uploads/file/53643589431.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a875594bb4704cde352f3915e2547ec4/lalemezovizamuxodataza.pdfIn PDF document text
    • http://rent-1.es/ckfinder/userfiles/files/sinikunoliwigolita.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/novoloxakikatapebedanove.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a07e1360d---nefapovaginasu.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/14300048103.pdfIn PDF document text
    • http://mamam.by/upload/File/file/rapuneruzawasonasirepado.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/vevegopad.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/65790762046.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/zinetuseziteri.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/wijazofenudubejezajovital.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b281b687646---99974804715.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d13431c49---75233464699.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/b24aec2ad2f523fbcfa4d0bc058ce264/rijekavobib.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/vinixogoxajovakav.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd12a0eb544---26584620293.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/gibidaran.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/74126096182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=verifica+firma+digitale+pdf+onlinePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 18028 bytes
SHA-256: edede10e471af6a45450429395b5f6c3457b00114a4136abd1fe905eda4355a7
font_01_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 10764 bytes
SHA-256: beccfd0e225297524e4fb309b87038a518b129acf663ca7e5639fd8a5d56dd18
font_02_sfnt_off00012e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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