Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a999c4da9aa51d…

MALICIOUS

PDF

83.0 KB Created: 2021-10-05 01:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ad2510cccb9edbc5bce9a27879ee38a9 SHA-1: f326d6702f55d51622925f609c69ae3234a27e5c SHA-256: 89a999c4da9aa51d7056ff13311ead67921590fc347de2cf6622d6740a3d74ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=steps+in+strategy+formulation+and+implementation PDF link annotation
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/96867131956.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/76482077185.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6ea606bd7---zuxog.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/xesijinixuk.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/palesexodebanurepuj.pdfIn PDF document text
    • https://777mto.info/contents/files/tikepanezofezotiluse.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/13133605870.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615ac77a1e6a3---vofijavodozatemikim.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161326b36b47b0---72752887710.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/wojokokubow.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e73dd62dad745335b82775dd8245e279/43830881610.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc671d365a---dadebibolilosoz.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/44168389986.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7450fdb25a92521845cec606c83f7992/vepilizidufuloris.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/8787542704.pdfIn PDF document text
    • https://wonkingchina.com/d/files/ligujavik.pdfIn PDF document text
    • http://limoride.net/gallery/file/29116023575.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xeperafokufaxujodelotu.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/pagixanotukosagajizo.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/gejatuz.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/84419341037.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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 18932 bytes
SHA-256: b35762188cf0bbc9708d32f39312422b3417251d699a025cd4f63e3e884c7b06
font_02_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 11128 bytes
SHA-256: 09a7bce0eba49191d79f6081481f88707c412c60439b85d3fa473862ff572622