Malicious PDF — malware analysis report

Static analysis result for SHA-256 de55fe2444c54ab4…

MALICIOUS

PDF

85.5 KB Created: 2021-09-03 22:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 665def69d49a9bceeea32104f8d0f44f SHA-1: 7213546203fdb961808dd16f7b5a19cdb9c6bc5e SHA-256: de55fe2444c54ab4915950200f1e3a7fc52cb37c039b18501b63a1f9df784a79
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing scam. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable. The heuristic 'SE_CALLBACK_LURE' directly indicates the document's intent to trick users into calling a phone number under a pretext of a financial or security issue. While no scripts were extracted, the presence of multiple external links suggests a potential for further malicious activity or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/6b73d8917bb6b45aef75bdeec3758692.pdf In PDF document text
    • http://dream-mebel.com/pic/file/xexajevaliribuxozanawawul.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160defec37b690---17894289978.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c355c6224---makalatibukakikotavilor.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c400de7ea0---20102240922.pdfIn PDF document text
    • http://one9five.com/userfiles/files/22302377261.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94d091248---28004303230.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/pivajuwagaxugojefelobugod.pdfIn PDF document text
    • http://9jamail.com/userfiles/file/rebofalof.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/31881486815.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/xifudamavozusalanaguxit.pdfIn PDF document text
    • https://wonkingchina.com/d/files/95874245296.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/geripowubiz.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8d3107e7febf87b0a03243ac303b590d/kefigomomuda.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/62478365886.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2c06e904fd6896057c2fa13e8b9af6bc/74260377252.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d5dda8b7---37828001863.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d43c3ac54f9---zexenewanukinepogenek.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/wijebemutivakomoguwaxe.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1473bfbdc---43125487959.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/afeba9f580af64c9b005d2b568e41242/46044625.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc7c05407a---gefipijoliwetipas.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/88714206189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=montreux+jazz+festival+2019+programme+pdfPDF 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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 11756 bytes
SHA-256: 14b815c2afcf10a874dd084c374c79c65e891b8697ac2a3152e25b67dcec5c4c
font_01_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 18744 bytes
SHA-256: cf3b2cf4d70ee1ae97e28ede5dbdbd42214754a742b56ca83ee43b070449d09b
font_02_sfnt_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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