Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bd664da9365e01…

MALICIOUS

PDF

85.3 KB Created: 2021-07-16 22:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 298a5132fc6dcd708b5880e13f58e4be SHA-1: 9ccefe61c18e06a0891284fa7edd11a174ce849f SHA-256: 08bd664da9365e01339edae55354d0c9fccd53798650fb19808316919344720d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous links to potentially compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The document body is heavily obfuscated, but the presence of PDF link farm heuristics and the callback lure indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://fvv-hohenfelde.de/sites/default/files/files/zunatewepu.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5a0d5f91fbfb7cb88a514e8d604d631d/11138391771.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/30702374089.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/bdaf1a43ea3a2bde41d78890752d536b/jogazanikojowojutu.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/lakugovotexavapufu.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e377e4927d4129b19444c08da304a75e/sofibifel.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ec63508ad5a62c77520b0827f747520/64989040695.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/98550391177.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/7189d06de40a4af2cd7320b530dd7c00/dafojawemozo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc773e923---91795052479.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/lokipoxokuwi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dacd0b283f---sizonugep.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/17125371944.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f4acc5ff---zumutufukitite.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077461646002---widumisivefawowon.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/tuwofudo.pdfIn PDF document text
    • https://robertbah.si/files/file/monatezalifomutituwuzupaw.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09ff2fcb0---tanovoxenuborupaf.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/79104181187.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/feratogoduvafasivelamew.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0308db76---34379557201.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc905287b75---gupukujowotamudelufuduz.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/goxipekufup.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/jugemaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wisconsin+off+road+motorcycle+trailsPDF 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_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 16564 bytes
SHA-256: 4dcfa34a469cea96d0d52ad2a72036881cdd5b435eacf168b38026d3e24322a0
font_01_sfnt_off0001171b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171B 10744 bytes
SHA-256: 3f9db75d531d703356339b0a24ca70da867daee798adf33d98dfeb282185e3da
font_02_sfnt_off00012fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1