Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c784b80930e5787…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 13:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37d1e35c964755d0bb85157c0301a54f SHA-1: 850b0ba5def3f99177a279f60abb196c0e551ea8 SHA-256: 1c784b80930e5787b28980a751a99e229fc5b14dd40f4e8630828182cef871fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to files hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The primary attack pattern involves luring users to external, potentially malicious, PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://blueleaves.ru/userfiles/file/jijuziwalozoxenezimok.pdf In PDF document text
    • https://thefertilizergranulators.com/d/files/65824001002.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141c9cba2b76---tadadexolodo.pdfIn PDF document text
    • http://4bx.pl/public/file/sarexenivovizazuwusuvixaf.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130af350ef98---tuxip.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/97513709757.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/i1o639g3lqflvn4csus6rlgsb4/lifonogavumodifolodaz.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210904120036.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/40757276108.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/22151248332.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/6016322640.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/9925984004.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/lesowetigexemonepoxupaxef.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/zikidobeparitizum.pdfIn PDF document text
    • http://asfalon.com/__files/file/bifafefofikagoxu.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109091907331828.pdfIn PDF document text
    • http://lgassociates.in/uploads/33638674941.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/geduzajaxewir.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6c773d651942dae38a701a7540d3873d/xezakipigu.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/98037873130.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/37387732122.pdfIn PDF document text
    • http://www.miwon.com.vn/app/webroot/uploads/files/vujegilepokav.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/19593130718.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/lbc03q0s6l5l60444bq6ru4f2k/80884495094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rb+battle+pack+promo+codePDF 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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 18228 bytes
SHA-256: 91e02fd7344d241f10d55d88028ad5d23e013e69fb280ed929aa00a97021d695
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 10588 bytes
SHA-256: feab58d31256f776105a877dc9a22e71caaa4756abef14a3e83587b44676117a

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