Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c79ee05e91345f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 03:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ceefc2989b1541d02aae43eb8ccd486 SHA-1: 6bfe14dd4886abf586593fb47be3a001a3b0c389 SHA-256: 42c79ee05e91345f0abe736151e442bda29b039a011794a0ebaf3e1ea6919cb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=atomic+masses+of+first+20+elements PDF link annotation
    • http://vagtteam.com/userfiles/Files/sawigi.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/80477774498.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/rudubotapumofip.pdfIn PDF document text
    • https://kawanmto.org/contents//files/rasoludekukanatusofuw.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/28549191140.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9c2b497f---12994148506.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d544a92c---32817406928.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/38711622506.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/8749144549.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d983b6a2---nabajadeparej.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e163a4fa---liwedokovamipivuxop.pdfIn PDF document text
    • http://aps-mes.com/files/file/zakopijirebosijidezid.pdfIn PDF document text
    • https://vientangluc.com/upload/files/likub.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161033e667312c---dikapupelavuvona.pdfIn PDF document text
    • http://skisun.it/userfiles/files/povitafigosavetix.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/ruxugubasisone.pdfIn PDF document text
    • http://vce34.ru/attachments/file/javumezenuziwuj.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/21159196414.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/tibapewazebofiwa.pdfIn PDF document text
    • http://mesahighclassof64.com/clients/874441/File/dumedawufibeximaliful.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ru8qmca48nth52fjsmti72fgt1/kemipuda.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/palivixigalexasoxobawa.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/65493801267.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/vipogeratabosuterawusum.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_off0000c0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 10720 bytes
SHA-256: cd7931aeaeabac0ea1ab23c294c4ea4a8e4ac9356956036a79a9545e1cbe6740
font_02_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 18752 bytes
SHA-256: fc5057779f1d4a90ffaab837716548d3466e2009b044ade28324560b5b0a9270

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