Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ce136b2078ae62…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 12:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 464e2e7c94643b8cc0589fccfb1a0b91 SHA-1: dd2ac551d58001afd0cfa23f2ab4fc1a1d4880b4 SHA-256: 82ce136b2078ae62a7e535d8571d58036bee60927c4e86a00230123a870d0bc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://laborke.ru/uplcv?utm_term=shapes+of+bacteria+worksheet+answers PDF link annotation
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/0def5ead2a11e75c335f84dd100bb3c3/46249263754.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f39e4fe0b99---miluxobawexad.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/24317358149.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/4670975335.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726441e3ff1---99691282431.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44e66b2e91---vituwowewizaz.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/raxobafulewilota.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/95937167273.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088ceab2376c---posatawun.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c873e93310d---zatanaveludipuvoxijen.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/filoxijowoxibaredumimaxo.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/mejolu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7233a4c6d---muvizunazedusewelel.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/u626umts4q55rb9o6gegrjhmb1/82610300033.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900c932ee84---27159911998.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/93191898199.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f368081f---10396687785.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/69817788612.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/rukenuraj.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/qsgv90btr92e6g4mj9ubv7moke/95202218140.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/86397582752.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_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 10924 bytes
SHA-256: 8a28c44724b92f6a67098cee69b8c0e9995c831644caf9ee6645e20aeadaa728
font_02_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 17636 bytes
SHA-256: 374b681170aed3c161d3a51e41e87aa67ba851082cc9f9ae5c05555dfae3b8af

Open this report in the interactive analyzer, or submit your own file for analysis.