Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d3975ad2143d9e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 07:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2e296c318fc4da3d744c30a9733edff SHA-1: 5c3d8c66a2b3d9bbfd1e91a928f49a25cec157eb SHA-256: c9d3975ad2143d9e7564ac243db6aee06ecd9eab41c4dadf3031cc30c017cb35
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains embedded URLs and exhibits characteristics of a callback phishing or tech-support scam by presenting a lure to contact a phone number. The presence of numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting, further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://hefcom-hydraulics.com/ckfinder/userfiles/files/27461675731.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0becd07aa9---66987533219.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/38458736608.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2ba5a0b076a7eea14e8fd15417bd2682/putagelopijisikivojonelo.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8f3eef47---62984512807.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4ebf52bf856d62150ad4dba5460dc434/43979044760.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9596577398ffba26db1acf74e7eb37c6/73195699372.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/4056014484.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/deviduguzeju.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c849de607---75717947570.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/75276015014.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbed6627e2---lolatopitax.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-6/20210906035030246408.pdfIn PDF document text
    • http://robedecreateur.com/img/files/97266218656.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec37e7446---29998938233.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/piwofepizov.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e268198690---totutoka.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/pelejigakisev.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/31472232237.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/4874510201.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/095f08d780577d2f53af39139dd8f99a/nusijejoxisig.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/bimivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=multiplication+practice+worksheets+for+7th+gradePDF 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_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 11220 bytes
SHA-256: 0d109b687ea02f8ffb3da5a6a1f8c158fefbcb974d428e994fdff15d03715b45
font_02_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 18236 bytes
SHA-256: c7e70be6070f70f5d4c31fb640f74f59c23a3a6b44efea8fc71953172d7cf623

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