Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c953075ca96c74d…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 01:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5740482bd262b77979a41d8209437ede SHA-1: 957eaaf1879914e8243bc7eeb748e57cbdf1f3c7 SHA-256: 9c953075ca96c74d3002e203e5f0ecadd9cd5bc2728dab5b38400a620a3765e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm pointing to compromised WordPress upload storage and disposable hosting, likely to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick the user into calling a malicious phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wksystems.net/HotelEstimator/userfiles/file/79285525756.pdf In PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/29850487998.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/vajojarenipiwovu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0d5eec9d---suvilavazijimepete.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/mowesezoxamakusoxilerifes.pdfIn PDF document text
    • http://remobudostol.pl/pliki/vamusumiwimodeludi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffae9bcf18---jinowakef.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/26658146066.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/22740083241.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7146aedfb9---46275631091.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/47923934587.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/v0q2m72j8a780madb2f76mbt63/vakaxona.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8c552cdbe27bd207ae2c5016c8568a3/rumat.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0m7et56oe8vqviboq227bp08c1/69586941603.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/36899448472.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c73333a8---83845658413.pdfIn PDF document text
    • http://gabortech.com/admin/file/37258667586.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/pejite.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/jemeratidejopab.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/rokinibej.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d78a756f78---kaxiliwozajenije.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/35a97116f9c2ef84b061d5f0c52b70cb/donuputonivujukodufiruju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=alcohol+melting+pointPDF 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_off0000be8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8E 16484 bytes
SHA-256: c7aa05588da5c9b45c6161a0a496e7a32bcb615e481165ce6023e64c3c6374ea
font_01_sfnt_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 10372 bytes
SHA-256: fb7cfd0224dca00d0d1b4267c4447fdebc4be9770f21828750b8bcaa8b2518b4

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