Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6cc10eb12d4b37…

MALICIOUS

PDF

89.5 KB Created: 2021-07-07 15:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a88cceba2ffb21378dfc8d77d74034ce SHA-1: bceac2deb29147d155c9d30e613c056feabef26f SHA-256: dd6cc10eb12d4b379d9a3e3daa8fcf7ce3d3aabcb9af514915d369863ce5e7f5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://patrick-jardinage.fr/ckfinder/userfiles/files/zezuranixorir.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/28a80533fbab6f7f368bdf88d5dd301f/40053684504.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/daxoberovolifugu.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/9995834bcd32db8a0bf1b74e8def0087/72166234216.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608290bfbd83f---xapulinob.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0807b625e---40981343208.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3sqp7bbfteipgv05c9a6f36ab0/265342605.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/12382998116.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/rebinizaw.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a8c4909bd---xovetoxivejemudaviwoxoto.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050449564299.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/43011116722.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/q7emrrk90l8su4dq07s47lh87u/52015213768.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/wuvel.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/kalineb.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/gazobatolisadisefulajidil.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591b40ba8b---xibosudevezusegol.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/57251364445.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/52570020205.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/15741632730.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/wofejulemadewixalexi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc82c15251d---gepumusovowubipeligav.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pgccu29fuaplpcjql82lu37jj3/50599216885.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tonepumizukaroja.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/6648611216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=product+owner+resume+samplePDF 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_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 10768 bytes
SHA-256: 5e2a1492abd5c5d7c7358214a1bdf602f520af90a345f705caf62dfae4b481c0
font_01_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 17688 bytes
SHA-256: b0306e6d0aee469f60035349adbbd20839e8d134a12117c94cbd1dbaca4268d1

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