Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d35642fe98d2894…

MALICIOUS

PDF

76.9 KB Created: 2021-07-01 20:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02e542bcc359752468cd79f6142b9a16 SHA-1: 15284b7f879bf8c6416329d52741214b464cdb9d SHA-256: 7d35642fe98d2894a2223b9806759c8bfb116328415e8b4e790522037eba2281
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan delivery. The presence of a 'callback phishing phone lure' heuristic suggests a potential social engineering tactic to trick users into contacting a fraudulent support line.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/d41b47b17fed9476f50324c463a55378/42957327174.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7e6d2165e---zofopalenugofapaboka.pdf
    • http://bajcsidavidfoto.com/_user/file/84646499997.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/eff4e5df47ee5048ebb1b04350b6266a/48747704839.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b65c32be9cc---xopezafise.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b79da33f9---wuvenifavopilanadulevuno.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/11e1e0f96fb1e72d870e12fc6df802da/80334622561.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b195fb7e---54342496749.pdf
    • http://chataphan.com/file_media/file_image/file/vavowitulorabenilakuwowu.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f7cfea118---88858635385.pdf
    • https://jobtiara.com/files/files/zolatopuzuromeweju.pdf
    • http://bi-acaovo.com/upload/files/rasumunodinijebupikik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=home+access+ccps
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca23.bin
c0975dfaa83deb12a33973e339c32eab75a8654349a2be60470802fb29815548		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 17712 bytes
font_01_sfnt_off0000f8d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 16792 bytes
font_02_sfnt_off000110ed.bin
b8b595671eb9ba97b7de892af7882b60f2bcf7fb0812c6869e446664378b1f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 10088 bytes

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