Malicious PDF — malware analysis report

Static analysis result for SHA-256 5042500ad9aa10e4…

MALICIOUS

PDF

92.8 KB Created: 2021-07-16 15:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c96c9034b4867fbd85ceffdcbc55dfe SHA-1: b9111b334053fa43dc271b03af4e7f615f074feb SHA-256: 5042500ad9aa10e43d62a1bbfbf301e3d8957eb0ca1e85d42458c3d0a43ff8d7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous unknown URLs supports the link farm and potential phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a86586c2ebf---71882190230.pdf In PDF document text
    • https://smsenerji.com/resimler/files/verim.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a037895242d---loburofikelumegenitudek.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210528154350.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/85637084738.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/ranutulixoriduxit.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ed70cbc79---nozirojabodubapuvuse.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/fonozev.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/52596639793.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210605104910.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4bcc1e3eadb59f18ccc922f3d8175b18/deworum.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/67530573536.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/95500dc1a74787a6867c1f3014c5b485/58055405571.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/jagavajewin.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/st6o7484s9v1teceiv4gjpdl31/tizodopopetepabedo.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/zogelukerijo.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/ziminusupajomirabid.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/xubezusuvivepupekifefoto.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/672b94efee9e550b751361b359384040/30656696826.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a880217c041---84095137846.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/77034200092.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c67f0a6d2c1cf8e78715f40c68c45bbf/90963713798.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607197d259ecd---vetabotadafututo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=apartments+that+accept+felonsPDF 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_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 17228 bytes
SHA-256: d2194aa5959b4b0736f7ccf352e08256f2c1256cd654f9a4f5e40f01c756869e
font_01_sfnt_off000135cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CD 10636 bytes
SHA-256: 0f9c6219e496a42980f7e051abc654cb2414d6acf3df70a47b7122ca08f1b545
font_02_sfnt_off00014e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1