Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6f9cece112fa3a…

MALICIOUS

PDF

81.5 KB Created: 2021-08-21 06:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2cc76bbc9c8736861e04bfe72a2155ff SHA-1: 0dabb55a1d6ac6ce00ecd771701fca42816a3bfb SHA-256: 3b6f9cece112fa3a0ef1c6320ba362eb2d6298067039d96fd4d2428b86fb71c1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to malicious sites. The file's structure and the nature of the URLs suggest it is part of a phishing or malware distribution campaign.

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 https://crewmak.ru/uplcv?utm_term=regular+verbs+pronunciation+of+ed+endings+list+pdf PDF link annotation
    • http://embeddedhr.com/ckfinder/userfiles/files/magebokozereni.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f64696e8e7c---vovebofekovevivuju.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ukbiq1tcvbj1d165a8cb6audu3/xanuto.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/vorexidizimopumorib.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/vajawag.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1e4aa5a35746ead272728d8263a14add/10558380316.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__611AECB85EC43.pdfIn PDF document text
    • http://fotomil.pl/ckfinder/userfiles/files/kufunijagonigo.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/sejamutuxuj.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/61260768117.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/nnfr3ij5l4968u9v9uijnrslku/lapokibun.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/85976807752.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/bajubomegekuso.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e7d4d9bf---notusaxedugufuk.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe5cc164f---58713038533.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/91819974445.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d30f82314099f507d0436bd957371fd9/patab.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6f438e5bc---6590789064.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fa6ecab2ed218691b18cb3b21dc56902/sedobowegagotenivarab.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/4210819112.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9a65ade6948c0451d652eaee5fe4fead/kasibamumimizaziraval.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae9de8ffb---nuzuwagebekunid.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d0f507ef976a60847a62449944852f26/lusokuzikorepod.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/vipuvawilu.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_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 11148 bytes
SHA-256: 92e498d1c3a926b6992931c38543a6c8aa28e7c72e53ff5ebca9c85c02c2b7c3
font_01_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 17276 bytes
SHA-256: 173cab7f3aaa1282a9d100debb9c55a483ff2fcad6696fec5e859e76445e858f

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