Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6805df88a9deb6c…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 23:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a882ece2250376fa5adf5a51ee9a22e SHA-1: 6f6b6ade78bcb5e5bacff91b981ea00e5d95363a SHA-256: e6805df88a9deb6cbfb4f89b38021c548510c3bcafce65066981f2d4d0489604
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 or trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads or disposable hosting, likely to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a phone number, a common tactic in tech-support scams or refund phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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 http://odpadykj.cz/UserFiles/File/67917742715.pdf In PDF document text
    • http://www.jasolasia.com/image/upload/File/fuluvapisobesudijunoni.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/19892566227.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08abb6a9f---vumematamifulisarobis.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o92rlg3590qj4gmhs5110cdsh6/mokusezuwaretujixozolu.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/sazugizaniwe.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/65659081979.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25463785549.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zifowelopexagoxusoz.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/rerozasi.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/getilizovafuvuj.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/74388649267.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/jrknio60c2uqkau9tlscmtfjpu/89515646052.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a269258f8a---79406300419.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/25325429671.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/juxotosojaletop.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/13571352424.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/jotexalujif.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/58428304372.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/44854610968.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/26148069619.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fotefofinug.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/lesirakugibolemejefoni.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/xuvekapuvodakakupo.pdfIn PDF document text
    • http://klenderbio.com/upload/files/69413592582.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/5135034400.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawivaravamukijeferelav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=java+lang+outofmemoryerror+java+heap+space+jbossPDF 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_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 11376 bytes
SHA-256: 3ff948ca0346e31415973807d3fafc45f13ee873cc2555d22332664465b458d6
font_01_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 17136 bytes
SHA-256: bf4e1c853269c67d6ebaedcd0d1d254b89c9421c772ea29d9562974ed9f07b08

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