Malicious PDF — malware analysis report

Static analysis result for SHA-256 da16144e762fd124…

MALICIOUS

PDF

93.5 KB Created: 2021-09-06 11:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0736880dc4d9df9eeb476bbf302b4d5 SHA-1: 092a7f5ee7d0227bf72c4c17666100a12d2ad25b SHA-256: da16144e762fd1247ccc952aa78c86fd1ed9b86c6324510bd12f63009a78893c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests the document is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://oniceh.ru/uplcv?utm_term=a+very+big+branch+icivics+worksheet+answers PDF link annotation
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/787cc6b2638b8fda7c0ac5f4924bc71f/bipikilubazofabakewogiko.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/74fffee2a3937201a9b70bedf189a515/37479651974.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/60056704619.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/paxale.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/84658188806.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c837ed9ae94125d2706b76414d4e1b37/mikaxefelesixokoxibadika.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/31811554375.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/rimofojutolefepixap.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6af6dcf74366afb91a9e56b6e2c57e11/69462547809.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/belatozinezu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160edca049561a---xudizadufevojido.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/90198856324.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/13566326056.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8dc71e19---letumiganibakajoxega.pdfIn PDF document text
    • https://tonitomov.com/picture/file/30685954181.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/rulefuxopetizujelenat.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7681265d5---83095124151.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/nusaluxujaj.pdfIn PDF document text
    • http://garderoba.sk/images/_file/javokerojo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e3d339796---96631981964.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/nekip.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/banowesof.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/pogexajefewataxonaxeb.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/88187614119.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_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 10940 bytes
SHA-256: c552d51550584ac111a8c2775af3cb2ca46ef60baa78d9fe4d441216591b385a
font_01_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 18748 bytes
SHA-256: 402ac4164ed2279d77758edaab03711dd6b096424fd4ff90f306b0522eb75313
font_02_sfnt_off00015023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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