Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be8e74272db2602…

MALICIOUS

PDF

110.3 KB Created: 2021-07-04 11:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 363910394a53676962f6c1bb3c656a53 SHA-1: 1a2395c86b8bc5ac7c612a2d86558d45dec74df5 SHA-256: 9be8e74272db2602999fbfcae485885c62d2628f7394a680b243e0c587485239
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious destinations. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://xo-sound.ru/userfiles/file/16762420437.pdf
    • https://faltprasten12.se/anvandarbilder/70/files/xubekux.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ca0e1070---vazukidafi.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790a748a334---50753830228.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f76ea358---94333723724.pdf
    • http://travelport.pl/userfiles//file/50967782579.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c17b0c0fd04e86839ead6f85c65515a6/8705171706.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/703eccf28567bbf0f91ca341c6aa9456/82923434213.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608492f8ac0a9---80295012687.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a773a58147---98526281052.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e8aaf7d755348910e7aedb2e5498c0af/liteso.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/10aff56f3b068ff4a5f83b1caecdbc5e/85610343174.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ed71a3cfa---15910971777.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160acf34c42e12---41026269544.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/22956a6c0fbf5f3ce475fdab3417651b/gewez.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90cf6a43b---xulevowulekilesulifajisek.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa501441f52---59505845351.pdf
    • http://stardentalcare.org/userfiles/file/ruwinasedeligemijemuwiza.pdf
    • http://www.puhito.hu/uploads/miboneku.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5cfa98ce68ff686eef0cf3d0a6b2deee/biwemexizatutidaluti.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4c2532aafef6d632ebda3d02e238c7f3/20385474314.pdf
    • https://finatwork.com/userfiles/file/30011752665.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=causative+agent+for+typhoid+fever
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cb1.bin
1c8e4a241d233cd1297d35907ee9e86b7e8b7bb5a7712c268ed0fdf8b216d056
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB1 18004 bytes
font_01_sfnt_off00017a73.bin
809f45a91e5d85c54ea3c38d0cb4874b00e8a8abcbe1c9df38b1f99f62378579
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A73 11040 bytes
font_02_sfnt_off000193fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x193FC 16792 bytes