Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12c459a39b25222…

MALICIOUS

PDF

77.8 KB Created: 2021-06-24 09:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b51272af5110ac7bc678fdf08c93ceb0 SHA-1: 40acdd1e295078424b3f59e31e7f6ef4fdab34ab SHA-256: b12c459a39b252223a514035083b09c9d86abfe137e0b8e52ee6f6445db2fdd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document serving as a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=cadastral+survey+book+pdf PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ee46d967---21344210756.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/77955614797.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/l1u0vl6hq2gf7qkedpqt2k20kc/71585455851.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb295d3d65---fapogimofe.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/91810372370.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be07358389f---zokujozasubonexukobumob.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e535c26628---25334843744.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/misonorog.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8eb7b1204d36bf85e78a0de2db6ebdd9/43399449380.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/68c62f1f4ba3525b50787ebcd45ac1ec/zifaluguxoto.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/vafawuxonikejo.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/94857294057.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jkkcfggm60mkrc4nnff2hcnj3u/golijelanominowozot.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210624_803FB1967F4994D9.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e89f56f861fce80c0121f64438f1d229/wofiwizataguneji.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/b26o1j3sg8l39ehkti9n4sj507/rasabebuwesipogoralisure.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/87378145492.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/67895058238.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/luvovanenufiwolopobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 5308 bytes
SHA-256: d2ae2c59788e875c38c62f809b7d9a253eb283338a8a596ed919881a3b81bbfc
font_01_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 10884 bytes
SHA-256: 3ab4cdc76d8df592a93592241541e192329aa76d0c0de72359491a9381eee9b5