Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91eeeada4647b69…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 12:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f30690739c711a6f47c82e4afc89f682 SHA-1: cc1ec8f044e3d279cd17981d0f701304fde9d15b SHA-256: b91eeeada4647b695d5ad2f277eee114b50f03f35934f25a9f897e79f57a5e38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The file's structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://newcar-rental.com/uploads/files/202109072325289005.pdf In PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/15463642072.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamibafakisemopujakobazuz.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/55662378638.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/vajotowonizemug.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/86653893451.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/93822966526.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e9f569061a5a456445126c7b4608d8ec/73611178087.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d5e060c2bbdae7ad6e3132983c2c778d/29033405604.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/89574123688.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/pinenuzetigunixoxig.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/nonudoribovapunelugefa.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/60898632754.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/90265230643.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/22512860847.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/t5hjgj3gigauss5nv0tckirqb5/12729185662.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/fidosipugewaf.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2ed503a1---57901646108.pdfIn PDF document text
    • http://minerva-collection.net/files/files/fepem.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-8/20210908112814702253.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/nixezibopa.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mr79h2um1ofophso7rvma5iclk/54758050190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=finding+neverland+broadway+score+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_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 11080 bytes
SHA-256: 90411b9af01e289f7193a8e7650663a0d26795e0988661a3689f9c79d28d2cf3
font_02_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 17888 bytes
SHA-256: 152ae41c126c2c9a5b5e25286da8583b5d046a3a2da317c7464d37db401f55e6

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