Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbba231a3cc28b6b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-12 16:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07ef8469e815ea9bdda3d8a219422f68 SHA-1: e6847039b2a83b93793e88b3ea972385ea56dd3e SHA-256: dbba231a3cc28b6bb88cea6ca70211d2bc7f79e1700eb76a74c9d595aa81cd52
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=5+player+games+unblocked PDF link annotation
    • http://lactopad.com/uploads/files/tarofozopaxij.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cf0e64209---videgivenizejeninuxim.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903222609.pdfIn PDF document text
    • https://thietbigas.net/media/files/pavofizazezaxa.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/fededujosovuwo.pdfIn PDF document text
    • http://namngonviet.com/user-/files/zazapipuzevedagewenulop.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/69079812168.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/xijabegetivetolarivugata.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/zasovonugowufuzeb.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/nagiduralobajomutiwan.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/2697386440.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09e81b149a9830ef2b809269bbc1fc61/84955918474.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd09b71867---95354247954.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/3829343805.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/67669248082.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337ae103ff2---dusosezi.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/fuvenosowopovini.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/92220480888.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/mefidinakogutobixepuker.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec5ed1505---73314385846.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/6956171950.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/80881217225.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_off0000b1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EC 15044 bytes
SHA-256: 07ba86e68f0636d23a48b854e4863b6fefcdcaecef0514c20d8dc92cf31d9761
font_01_sfnt_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 11148 bytes
SHA-256: 5e4e998e29466dd17e9fd4a7a800b7eee3d4ebbe967c208042a9fd7bdd0d316d
font_02_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1