Malicious PDF — malware analysis report

Static analysis result for SHA-256 41df08079f5507a5…

MALICIOUS

PDF

94.5 KB Created: 2021-07-25 16:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d401b1d527bd66d665b23a06f0e5e8a1 SHA-1: d92c4ec46708d4308f6f218ff2ca42afe235bd1c SHA-256: 41df08079f5507a5461256e6b58b2ffd65d5c9d0340cb0ab72e179c04014b25b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads, and a callback lure suggesting a scam or tech support pretext. While no scripts were extracted, the document's structure and URL patterns are consistent with phishing campaigns designed to trick users into initiating contact for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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) documents that carry no urgency or charge/dispute escalation.
  • 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.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6127cd8d73---55184437208.pdf In PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/57f009523dcecc333a0d74bbce9601b4/13052515075.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc50e8e8247---laraximugavesami.pdfIn PDF document text
    • https://proxus.nl/file/67440812876.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/cnq45dki6qm2eo4c0t854cf7kg/789453673.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d81b75c5---madokerakamowologaxal.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/lufepujepikiroze.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/63278663908.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/109d6abd203f1b90b194a8b10a0fab7d/36279659531.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/22722113627.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/beganone.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7645760ad992f5cd31e6df34de826449/rigapede.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/setazesusoli.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2dcd30d84---zenebutigekoxepel.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/dikumizapofelekejojileb.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/529de1f0f59e9cba37f130c6db3af687/zomusemerobezinoribiz.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/8069760993.pdfIn PDF document text
    • https://parfumzone.ro/files/file/53676891561.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe48d7ddf---tinefozubegupimujepexusop.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608076d9bb30e---17255080987.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/repoxolofika.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1ea5ddfec954278ea319e492a22aa836/51310743597.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/diwuku.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760c3329a48---rimorot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=metropcs+change+phone+number+feePDF 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_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 11024 bytes
SHA-256: 93e3738bbe8b6ee8fcb3f7411b56ae7dfee058b46aba1f9c39a3be2aa061a4fb
font_01_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D51 18148 bytes
SHA-256: 18cc4746e90a3b9dd5a42a2e56f3dcea10747f5306f424573c999426741e09db

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