Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45b51f812600c27…

MALICIOUS

PDF

97.4 KB Created: 2021-09-04 02:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5b71328f7fccc4e3da97d5243eaad86 SHA-1: b401c711bf2d01cbba07e661f6cce93b5692d89d SHA-256: d45b51f812600c278a8e9f78eac46b04b96f655eaaa385d6425d74ca38ee5b37
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://energo-market.ru/sadm_files/15029557093.pdf In PDF document text
    • https://melnikhouse.com/userfiles/file/zilafemexekapupanedupiv.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e61c824c12bd2d03999aac81b2db6747/58494980149.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bnl3cr6mm75ol3jqjhur20m50c/tinidaperod.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/suponuvuwak.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/d4n0h0rpclg7phtlb2cg32cokp/63590125327.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/70095a4461bdf3a1cc455ee60b8d5e96/70085340695.pdfIn PDF document text
    • http://fygl.net/uploads/file/222042331501.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093400db212d---jilor.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee6633bf46---fasirevo.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/66054849278.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bf2c58047191568b7acf9641bdb7217b/wikimivizamadukiv.pdfIn PDF document text
    • http://aquatherm-graz.at/files/wepalerusodogimejop.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/juvefalamo.pdfIn PDF document text
    • http://ligneus.hu/upload/file/94490127774.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/lenobojimevizome.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/83418133104.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/gegajo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a2506680e---46259997957.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/21909070844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cycle+country+atv+plow+manual+liftPDF 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_off00011aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 10868 bytes
SHA-256: fe46e693e844ed03c4bcab676b63175a5cb285dea75454b90d7b187e38dd953b
font_01_sfnt_off000133d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 17020 bytes
SHA-256: 42d7004ee74967ad580a4dd92186c839c80b485ff404ff3f385596c35bea6d08
font_02_sfnt_off00016003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1