Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d64bbb872ed53b3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 10:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f97da38dc96783418ac62e7b23981d98 SHA-1: c61899b3d03a1683597dccbfe82d7b0dddc96265 SHA-256: 8d64bbb872ed53b3f9ac752f677dbf91e435a8c33bde025a38ed8fc2d735630c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=love+theme+piano+sheet+music+pdf PDF link annotation
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a559c1e48---besejilijoduda.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609327bb4bf9c---48170270231.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/26845997788.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098699085479---54869851912.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160762b52281c3---dabiwulugewizalunipuripi.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/60570223128.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/22677082168.pdfIn PDF document text
    • http://thegioioto.store/upload/files/bobekedofetuluvejode.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/kutelokamaka.pdfIn PDF document text
    • https://rjpexport.com/files/88882737058.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/bokitebiwukuxofa.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/l1ejqugpnc90a9lkg8vd16o9o9/matudofada.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/58023407165.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/68359687290.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/lawoxikoz.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/nowalafizusiwuwuxokupare.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20218201113581668.pdfIn PDF document text
    • http://terminsk.by/pics/files/28610853837.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e46386b60---figaxixaxuxikavelatubule.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/89491468466.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/limupobe.pdfIn PDF document text
    • http://ippon.lv/uploads/File/34468736068.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_off0000cef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF5 16740 bytes
SHA-256: 8fdddd5cfcada842d81b8fbd1457201e885e3cb5de18b9056ce7da7522556f7a
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 10864 bytes
SHA-256: 6c11a7737d736815221da75e3d72fe2ceaec10e64c9b4e27702322d21f083f39