Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefc79b67e4c97b9…

MALICIOUS

PDF

75.4 KB Created: 2021-10-04 06:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e442cf7b3c639d3073c2500f8dd15c2c SHA-1: 9adc0bc2f6e4c421ad19eeba512fe4ff1e5f4488 SHA-256: eefc79b67e4c97b91c489bb1eda35c9d4872bfb8b0b1dabc3ece616e883a321b
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the URLs and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=pulled+levator+scapulae+muscle PDF link annotation
    • http://isystemlab.com/admin/ckfinder/userfiles/files/telako.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/55040060168.pdfIn PDF document text
    • https://dom-titan.rs/files/taxibi.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/96054011573.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/pimur.pdfIn PDF document text
    • http://marketingnews.fr/images/file/kabazat.pdfIn PDF document text
    • https://mattress-leader.com/media/lamodenepato.pdfIn PDF document text
    • http://envigest.cz/upload/file/78550250756.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/mewuxowu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e70d31a4---levimow.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70444244628.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/60552458523.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/58efbf52d83bd250af26a30b312931da/makixejaf.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/jogixifof.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/pemojokorebuxewixom.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dda44a573---14561372883.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/57056572356.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/tagilerafef.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/medejijozanib.pdfIn PDF document text
    • https://icbacademy.com/upload/files/mokibukanef.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/98772979565.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/tenigifog.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/17248515865.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6f953a9a246393d99edcb0fb7d21470f/jasusedatitubiwivufekow.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/42e241bc55a010b8a427da364a2f8a77/gepalumamugupotoloturuguf.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/39277018248.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_off0000c103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC103 18168 bytes
SHA-256: d07ee9c3098d49309ec204719f1d94a40b0b04db1804312e806abd5e5f4aaedc
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 10648 bytes
SHA-256: fcb6b0dab1f71c7beabe4c58cb17bac550a9015a5cc633a1f3ec969821f2fde7
font_02_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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