Malicious PDF — malware analysis report

Static analysis result for SHA-256 b581f8cc01ccf1fb…

MALICIOUS

PDF

134.9 KB Created: 2021-06-27 21:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cbe9d85de306f653dc358895c20e27a SHA-1: 5897384a09230d05e64fc8fbeeefa97f93caf1e5 SHA-256: b581f8cc01ccf1fb58708b4a4ba9dd21af2f73adaae321f5413d97ff2c0dfeb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates tracking for malicious campaigns. ClamAV detection and ML classification strongly indicate malicious intent, likely for distributing further malware or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://infrive.ru/uplcv?utm_term=call+of+duty+2+cracked
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d11646e724---bejozerexix.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/bd136057bc2f89cba7fe9044b36d3d39/fusipuwijenepeved.pdf
    • https://thinkhigh-tech.com/d/files/99270528385.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a80f7376a---teniraduvopemamegitutiduf.pdf
    • http://bright-mineral.com/uploadfile/file/2021062300304198.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7d412q0ma3nlu8k7ietddimcuc/22354717129.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/l6lm8rfj06269mp6g1sifaesnr/raburabadaxogazin.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a920bb0dcd9---kunotatisomal.pdf
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/14246882016.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e52c14e98f---50171035538.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/d954argmom6jmsb427q1h0lpe1/rekukobosaxaro.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/98727d3ed2c8af392a59408ed594620c/24681774635.pdf
    • http://automsystem.com/UploadFile/file/20210526071451778.pdf
    • http://keifo.ru/ckfinder/userfiles/files/wimutarujikamoxebesanufib.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c86bbd92164---95121241409.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2e3386db7---56289047866.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/slubaud10f0d90uqcap577gllh/sojaxepoxazuvezebanozilew.pdf
    • https://m-astar.com/UserFiles/files/43038715984.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cedcf5ae410---bajobu.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d11a0bff4---35338329079.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608540acb2f2a---48858277022.pdf
    • https://aterhesseg.com/up_image/file/84444912635.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1paqp2n6nv509qp8827t1o85uk/xutudidivuraziguwasetib.pdf
    • http://sl-light.ru/design/img/upload/file/dexupovuwebitepaxib.pdf
    • 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_off0001a99b.bin
03913c3375854e3fcca1267f9552dc8093273dcf421aac4e02e4ebf50d409603
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A99B 10564 bytes
font_01_sfnt_off0001c208.bin
9e1ce157b3ea354954dcfe820d6788debb6eab97dfd8021f4a82ed9e21660ac7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C208 19372 bytes
font_02_sfnt_off0001f5bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5BD 16792 bytes