Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67908d859e489b6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 06:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4515c9fbb54e8d0a9a92f0470c28739 SHA-1: 484f6e65c3a290d82e3feb35308d256e47d7b7da SHA-256: a67908d859e489b655436667f87f30a1604cc5f5476022b38b9a225e0c7648ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to potentially malicious websites. Heuristics suggest it's a link farm on disposable hosting and points to compromised CMS upload storage, reinforcing its role as a lure. The ML classifier and ClamAV detection strongly support its malicious nature.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=widgets+android+7 PDF link annotation
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161350d3e2f644---sofetaror.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/4782403882.pdfIn PDF document text
    • http://live-net.it/file/81365855063.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/63554401035.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/rezubajekew.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/zisexiliti.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210915144843.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/24060326044.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/zatewobakewomonovokujav.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/38f2d2d79d6d12bba754929051f76aed/mizofaziwefolixetukekaf.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/funavexefegabirop.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/47219650220.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/geraxefelagowusozel.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630558094.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/jamivovijusadulaj.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/nemoporogupixoxakajof.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/zilifomaxawa.pdfIn PDF document text
    • https://invision.buzyhub.com/files/70198989547.pdfIn PDF document text
    • http://nscenter.cn/upload/files/92970675033.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/lenovunox.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a909d0c5e---60123511923.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/39423554040.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/99399356697.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/88936813852.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_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 16600 bytes
SHA-256: 144cf2442d34bb4655b1cd7462ac4d84abb701f63fb4b1c8fbcef84b5bb072a2
font_01_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 10420 bytes
SHA-256: ceaa91567081322b7ef39c15c4f987a02ccea0de4a7489b92992b0c9239ef7aa
font_02_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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