Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c26baafe3d96fe…

MALICIOUS

PDF

86.5 KB Created: 2021-07-07 23:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a9b458326aeb68e570400d52c333f2b SHA-1: 3e36dd0420c3c49fea39fadd1c44ae37215e70fe SHA-256: 10c26baafe3d96fecb4f8db07d9894ee6c3e3f7de1db8e8fc9bedec68293d300
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. The document contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. These links are likely used to redirect users to phishing pages or download further malicious content. No scripts were extracted from this sample, but the extensive use of external links suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=in+front+of+your+nose+george+orwell
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608122996bc94---96049075598.pdf
    • http://bukharaatlanta.com/sites/default/files/file/mufelalur.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/68f8dfef417e10b8f064832052973a7b/xagujon.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a0561cab---1630455678.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607592709679e---9664182269.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d98c4a4fe9---36885104349.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/db3ouqbicsq1pds3odfpbul1pr/84095439029.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe49f63cb9---74409474772.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c6082a307a6---fagabomodugimuziwi.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/06880bc3d658141c26aa68a3b4608d4a/lusatojinapumezisor.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c38be1aa979a74bdf68b34f03a6166d7/18402436241.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/fedutewebisujogelu.pdf
    • https://agermag.ro/mm/file/9994032410.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095b540997db---95716224350.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b5e94a4f6a3708efcde7b64939ed2aa9/77260738413.pdf
    • http://stringquartet.biz/web/images/fck/file/26100570569.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/18073323642.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ef6ebdcea---87306922957.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c1866bd94de9d91fcb5667dcd2ced1c5/35406280797.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/99d1b217a12610a7acc88438117d14e6/xufutolisopamo.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rbgp7c4krpaifo7kpaj33e502v/guwosaso.pdf
    • https://cakenepal.com/userfiles/file/4828419124.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bc097e85---85365034206.pdf
    • 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_off0000f02d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 16792 bytes
font_01_sfnt_off00010844.bin
57e377c842d12e03f393d9f5f4970c8a92c54b2d442c586dccd5be180891e40f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10384 bytes
font_02_sfnt_off00012003.bin
31820c8a9044bb5577dff74306343f4ff839accd2724ca8b7a0565be7e63d28f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 17204 bytes