Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb394436c1e51e8…

MALICIOUS

PDF

76.8 KB Created: 2021-08-05 22:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b838915b3ce53e2e2252b1d0ffb7f3e5 SHA-1: 8e9464c5ee99a1408e86732545c18b6efa99ff8f SHA-256: fcb394436c1e51e8339b475191e7dea7594b46fa6a9c4eb0d71dac264887bc6c
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 compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the nature of the links. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://youandisagenix.com/ckfinder/userfiles/files/76339244562.pdf In PDF document text
    • http://tiszaikaland.hu/upload/file/fezexejetinasasexep.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092e188c645c---siwubafazejebafiraw.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/31278f422861bf11efa321e7bdbb6d9c/duwokokuvupilijela.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9ep2120kq3r733evbd5ue8n3jr/37511424022.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/49510137190.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/gimupubale.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/rodizidaxokodasaduboga.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703bc08aa1d---29211981156.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4411ed50---jimemagakebiva.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/699becdda166c5cb1a5e8b94b91c0367/79423183287.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/pepifapobawa.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/82203993552.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4de5eb91523ef1292cca4768a44c3073/pusika.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/88449583818.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb363837e1c---1217271288.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/35468834659.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/tibatozika.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/jagodegasurisuwonosig.pdfIn PDF document text
    • https://elektrona.cz/files/file/16558592038.pdfIn PDF document text
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/vegiworinusutimemu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cfc00d7e---10374764411.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35995558fd---soloza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bhola+hai+bhandari+mandir+ki+sawari+dj+songPDF 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_off0000c5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 10968 bytes
SHA-256: fb9a8f210d6e3aafc0ed75b9ff0df4890710165daafc4086d943b03ebe6c0063
font_02_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 17588 bytes
SHA-256: 40995f417a448a06de8d22553c7b297dab1dab43fa21d53336efb41099358316

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