Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3eca64251f96cb8…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 00:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6760c94bb8707011435d0a00e3e9292c SHA-1: a09c50aa8d7fe559dc9f21dae13f5f4624633565 SHA-256: e3eca64251f96cb8bcd544b340f4c75d02896f2bf7c2ee315ad0875e32648d61
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gramercygrand.ru/files/file/8339120051.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ec2e496e7bed89af410130a561b02e9a/98677249053.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c390a9dc9---52602788303.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5c60d97c---19912417788.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/58dce09ece6e6a9888b93eed38429b5d/68244493244.pdf
    • http://tasteofruraleurope.eu/upload/File/48009027103.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468c04fa72---werizur.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d49c45964---nukumobebi.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd268daf0ed---92315471750.pdf
    • https://vicotelecom.vn/static/source/images/file/47845390884.pdf
    • https://saatyapi.com/upload/ckfinder/files/75979238573.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/xinakufuvizaj.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e862c49e751f851291493648584d75e2/vomesobokofuraf.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6086821c03fd44fab3044e52472e0763/25852031159.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/nmv8aube79ujer5ofb3hb2vsvm/40412766299.pdf
    • https://aduanaldelvalle.com/userfiles/file/79338919174.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5sl1bjsf08eael0grnemckpnnr/47454256982.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/bogukif.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a7771d21dd5---joganivowesujadusa.pdf
    • http://nadiadsa.org/userfiles/file/81203830653.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+find+blocked+contacts+on+iphone
    • 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_off0000eb5d.bin
9190c24e0927e240e9d81061eefb9608fd220e7c5e11645931299af2a61ad383
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 10924 bytes
font_01_sfnt_off00010463.bin
ca3d5358035d0c398de40117d45fd232b9dbc8cd29ca7b43dfecc69ee89ed5d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 17228 bytes
font_02_sfnt_off00013125.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13125 16792 bytes