Malicious PDF — malware analysis report

Static analysis result for SHA-256 b562d3d5eb525e9d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 02:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f02d613270ec656352e9dc2f8c7a5ec SHA-1: 9b2e02149163734b92576390a5c9b903c91b33e2 SHA-256: b562d3d5eb525e9d5f265467ad916c7b8949d466f736ee5a18c4f947e458c164
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://artikos.pl/userfiles/file/lonaloxexonatokususovobu.pdf In PDF document text
    • http://www.jobibon.com/admin/userfiles/file/lifuvarobeta.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/16865971958.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/95875738906.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/95686755003.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614026a2795c7---fudivimosogelu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4e32da4bfe2f73aad17324f7f168953a/vedefewowotekuzexa.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/lovotatuda.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210915223851.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/20883519746.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/11110171769.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/283214054e76504b8373da705237c5ce/seluxateru.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pegum.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/kemasafudivajojejopu.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/waxuxu.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/sajujelonodo.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/tabaxipiredexalubilezevo.pdfIn PDF document text
    • http://www.og2c.com/images/file/98563786263.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/mugudibodigotexiziwisosi.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/81731204649.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/9224127366.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/88899342101.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/tezoxuderuzakure.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06924c249---tunogegolewekinozila.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210916012628.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/paluti.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/midofilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+reset+my+android+phone+without+losing+everythingPDF 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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 15716 bytes
SHA-256: c34ca57b8f71469156dc5bd9c59f572f2780dd34be28dd33637eb9568ee44a54
font_01_sfnt_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 11196 bytes
SHA-256: 95bf59825a33ee6177c50d52e9b7ba218550753f2697c416e66a92fdaa5283f9

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