Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe7d2dfc3d42669…

MALICIOUS

PDF

93.2 KB Created: 2021-07-07 10:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 781915e9cc22b220e9bc058ecaefc9e7 SHA-1: a27507a2b84f4305c8f3d911981e0444bdd0fe73 SHA-256: dbe7d2dfc3d42669a9c9ae05f6b3d8aeae1de619dbafc89cb579b4f7aa49ce8e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://alshaabcoop.com/userfiles/file/jasodunaf.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ea720a2ac---69101625088.pdf
    • http://bajcsidavidfoto.com/_user/file/javeki.pdf
    • http://whuntex.ru/userfiles/file/80087508421.pdf
    • https://aprilboya.com/userfiles/file/litezab.pdf
    • http://mywayrtk.info/userfiles/file/68398438955.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cf99a6d77168cf07f2023e956f8222eb/49780233525.pdf
    • https://ajitcoatings.com/uploads/wilokebusagaweful.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/37f63c70eaec697a3671f3bbbe87a35f/sejavasidixejalabiwodole.pdf
    • https://nisahanpin.com/calisma2/files/uploads/kepox.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/34181840998.pdf
    • http://www.golfusa.be/userfiles/files/21264196498.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607670d31868d---zimowatizupuwuwe.pdf
    • http://noahsmarinesurveyors.ca/userfiles/file/88343381969.pdf
    • http://botosani.ro/img/uploads/file/pewisifobuf.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e51d615e---balof.pdf
    • http://tokstar.com/_UploadFile/Images/file/44010587951.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c11d09618---fajomusenubedevemefal.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b801eee5502---32055915887.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5860ddeca---91953291864.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/sf84fqceqhmgc5f5fl1uicdg3e/sumixowobabidoxetefijas.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e882690cd9---jigufamemoku.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091462aceb11---23374790396.pdf
    • https://seedomoretravel.com/files/files/74732830078.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sister+having+sex+with+her+sister
    • 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_off00010ace.bin
60f78c003eedaea589a31100ad8911f5e7dd3c455194db968b5f87cfc523b6ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 10548 bytes
font_01_sfnt_off000122dc.bin
4bb2c9d66151d77fc4da9c4e84aa569a2aa817f7210749931ff575e2a5b17891
pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 17340 bytes
font_02_sfnt_off00014f9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F9F 16792 bytes