Malicious PDF — malware analysis report

Static analysis result for SHA-256 055217d678cee870…

MALICIOUS

PDF

98.6 KB Created: 2021-07-02 10:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0aa08bfb24f38111a215f70ce5e6058e SHA-1: cfefb5ecbee705d517dcaf55df487296ee3c2996 SHA-256: 055217d678cee870dcf663832dfdd085a1952e85aaf20d5a418724c4496a9576
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of invoice and callback lures indicates a phishing attempt to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/1l8lba8uqfcbfeu1no68qho8tc/kubesisepozeseluworinetor.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27792107c1---lodekuzewixibavaxasu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49da7b55a---25680986985.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2fff7d1fef8a3f7530d9dce0b4053928/21626167358.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/4e90e4ff89d2e805f3d803cffc411a38/70500753634.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785a065da6b---jobikegujixonusas.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/12d26755f52b091c1aa3205089fda552/14314940357.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/fipefumurogonomu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/neaplpip4t9jt69pkijgguut32/35166747594.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f75f0ca758fcd85a24e670741133f707/sibowijikigogenemadekitud.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c9e2bf2bfc565f3c8818c067130050f8/19607028156.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/2770525477.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/64ksdhk8voc4lac7ro80jlvmf0/87391823004.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/sivepanuxawupi.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c4adb9dcda8c7d91531bde19056a06e1/rotejapivepitojubif.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/69227532512.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/kufegenivadipat.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/69144281372.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa4bcbd9c---saxuzilamefiramudajasi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/xozokatofizawuxoxenipez.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/takedibogokawut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=roman+number+of+100000PDF 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_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 16612 bytes
SHA-256: 03e110dc03713ba01593d4542b7e50f6987a9f3a2ac24503dd88a4d9b1a51c7c
font_01_sfnt_off00014ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F4 10432 bytes
SHA-256: d4de4dc3a40262330b189e3e45ee8422b549dfda0328d884e3175cea4a55f76b