Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdad8efd942f9259…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 02:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d50735bd7e6e7071dc12b63a039ee9a SHA-1: 1a8977584fc020672dde13eedd62302a23d26d46 SHA-256: cdad8efd942f9259ae2f394ba9fc349be3f583ac8c5fa95f79b9ef84e97c5f40
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous external URLs, many hosted on compromised CMS platforms, suggests an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=android+push+notification+delay PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136fa4c9789f---31140483731.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/48684287194.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/24307712046.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/refuvojizamugodidezutarif.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/jodizuzifapovulilas.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/44614101831.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/16649438306.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/31231399454.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/damavemo.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/josipe.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/3010056321.pdfIn PDF document text
    • http://kd-council.com/upfile/files/vufutogepaw.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/85982508207.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/joxuzejifur.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16aeaca85---3507826777.pdfIn PDF document text
    • http://noithathoaphat11.com/upload/files/bubizelemusij.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/91411102910.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/metogofebezodumul.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/wuwur.pdfIn PDF document text
    • http://boldogelet.hu/media/13301684434.pdfIn PDF document text
    • http://montesantangelo.it/files/files/91795666176.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/43a3a1a0a26613b10e0e22374bc34a96/luroluluvog.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/puvakugitafovupeb.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/81341940132.pdfIn PDF document text
    • https://forums.androidcentral.com/showthread.php?t=911157&s=2D7449FBC2B082CB39EA56EFF63C0359&p=63464In PDF document text
    • 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
    • https://forums.androidcentral.com/showthread.php?t=911157&s=2D7449FBC2B082CB39EA56EFF63C0359&p=63464In 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_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 10912 bytes
SHA-256: 76b2c5c6e9de51058456cef2c4d2eeb575ea5736bcf74f183ce32fd81ab6e54d
font_01_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 18292 bytes
SHA-256: b5876327ce0cfcf336d6c1fa19332ba8b3b00eb53e7eccb487be847e31360aa9
font_02_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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