Malicious PDF — malware analysis report

Static analysis result for SHA-256 2139137566cbf2cc…

MALICIOUS

PDF

99.0 KB Created: 2021-08-09 14:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15f5e44bfd574157b0e0dcd694ba34dd SHA-1: dcaf92d235335aa592e291baa9a522535cbefbf4 SHA-256: 2139137566cbf2ccc284bd71e10a1b8edd3573764f73fa4e4c42631289612ea5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams or callback phishing. Although no scripts were explicitly extracted, the presence of numerous external URLs, many hosted on compromised or disposable domains, suggests a phishing or malware distribution attempt. The file's structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=bengali+movie+song+download+mp3+masstamilan PDF link annotation
    • http://suncitygroup.ir/basefile/suncitygroupir/files/raludofedijo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aec22187274---gidaraw.pdfIn PDF document text
    • http://emannsltd.com/userfiles/vesamapaku.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/rulodusifajigi.pdfIn PDF document text
    • https://medtek.vn/storage/file/degiborugopotenesez.pdfIn PDF document text
    • http://ciskmv.com/css/file/jenujukugivalu.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107160605023973.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kerananutabat.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4bccd488---81056325170.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c066917fee5ff0248723312db1782cec/nujukugijerexaxivavij.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be16603d04f---xixafipidaze.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/86254363924.pdfIn PDF document text
    • http://clingac.com/d/files/9122846619.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/98368965204.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wokema.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/79856992132.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/gisozoduxinewabopoz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608266ecb133e---28364267669.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/598a241f85b774769ab25b4ca74eae04/redinoweserogagav.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ca15b0df7320933440172c7e826c2afc/puzuriludukuga.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/konevazeminafozemexa.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/17130123746.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/lodosaga.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160918b8558b09---gepevonasu.pdfIn 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
    • 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_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FF 11012 bytes
SHA-256: 9549615328144ec38b8d5c06c0e064c1810d4c5b0fdb568a2786ccf1938ce5ba
font_02_sfnt_off00014d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7F 17948 bytes
SHA-256: 25764aa09eea2b56491c54b480bcef7959fa3e6965ba54449e23d6fe09119591

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