Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a864381cdd0a352…

MALICIOUS

PDF

89.6 KB Created: 2021-07-07 14:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff3b0d3e64376416c91e215a383d8dd2 SHA-1: 256ea34dd12d8a6707a0fc8616d2700876a5e8ce SHA-256: 3a864381cdd0a352a57c2ddccde970c91e97c200c94bf414501d6fb8a0758f05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's upload directory. These links are likely used to host malicious content, such as phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928050b0ae8---19809111858.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16096a43426936---torevoxeka.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62c3af48f---12501403991.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a77e2aae8f0---74905793547.pdfIn PDF document text
    • https://cooperspick.com/files/24189245375.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b63e370b---15543022745.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e63f5c5e34a2993ff7baaeeca302a8aa/suxanebixikikigapak.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/62425302042.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/xukaduzevazevusimejex.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9e9db531---botimawubajaja.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/93512738384.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60bfe54754---vodexaxofuxowaluji.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607764a9be510---74581347426.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f203631e0e19366f52c258a9141417f3/20649783861.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5af9907c2247de647633350a580d8beb/26421714840.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gvvld1h3eldhb3krkn0dgoh5k3/kawine.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f44b885d8---zirirexivu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8hi4tje44h1psqbf7aoik1jiq2/601378155.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/90944351348.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e6b559025---rofenuzaxawugono.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/e1d88f29d8b392d1b0213f447b352bf0/12649042481.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/47400450817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=distance+speed+time+questions+and+answersPDF 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_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 18456 bytes
SHA-256: 0e1e9cfd4449e78959478b4194afc5dfb124c9a7e9c1bdf4624731a15032214c
font_01_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 10964 bytes
SHA-256: 1befbe54f48c38cb5a27041c5e9f9ad0d48a811e75cacf69efee7f533070da50
font_02_sfnt_off000140fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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