Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b79a7ef6ec86158…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 00:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ee8d6e71a61024fa75790f619fd0f439 SHA-1: b1243685e29e5263dd5f0d30b1e48c39f3cc215f SHA-256: 7b79a7ef6ec86158c7132045581be5e5092816b0c461fde8ca5c877315b92bb8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a phishing lure, specifically a callback scam. Heuristics indicate it contains a link farm and is flagged by ML classifiers and ClamAV as malicious. The document body is heavily obfuscated, but the presence of callback lure heuristics strongly suggests an attempt to trick the user into initiating a phone conversation with an attacker. No scripts were extracted, but the PDF structure itself is being leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cs-nippon-cp.com/mailmagazine/upload/files/39890844249.pdf In PDF document text
    • http://studiomanzetti.it/userfiles/files/kakefi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d5695dac6be0c96998e2a9b63655045c/borupofevafobov.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/remobusim.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/41482666992.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-9/20210909044914272718.pdfIn PDF document text
    • http://fygl.net/uploads/file/07160830515.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/rufusopezetegojufezinef.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/47591018850.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/gomazoterufiwoxazarid.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/53550888478.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/53627282806.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b27117562470b79403d0edd43b3f2c7e/fefefodiwezasuwuf.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1cc3c886d---41226682731.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/33599969789.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/85e89819e502d1c8171049a27678eb4c/71006008651.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/fofipi.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/fixovamepoluw.pdfIn PDF document text
    • http://cy2hand.com/userfiles/21892473215.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/foziwelumenemobadew.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/rupanapobuwubumopufesaxam.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/79794484392.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/tivap.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/fuwebovexobirazubefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=queens+gambit+watch+onlinePDF 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_off0000d038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD038 10964 bytes
SHA-256: 936027fb9ab47400f8e51e41fe5caa8251994a4d0d9b58fec98f56aa4388449a
font_01_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 17724 bytes
SHA-256: fb0c4e8a8669e092e3f387c58d28f5106b16d491ec8de32ae4bee0dbe20891ef
font_02_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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