Malicious PDF — malware analysis report

Static analysis result for SHA-256 0397748996077fb7…

MALICIOUS

PDF

137.1 KB Created: 2021-07-23 00:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cd8da7049e1f893479c74c1ab178a86 SHA-1: cb1ba41b611f8625932fdbd22028d14fddbe2246 SHA-256: 0397748996077fb7a988761555df876b88d3b1325d4434949259a7983e7da8e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as lures to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be6bde9a5---64634878015.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecade8df1b---6531500973.pdf
    • https://yepsell.com/userfiles/files/57271336394.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be32409f4---tetinakufuwudigalituzoj.pdf
    • http://auxerretv.com/content/public/file/tavilewelekegazit.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/38010680042.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/tugixukewufiketurokikake.pdf
    • http://ferrocom-spb.ru/userfiles/files/79787391456.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6bb51c4a6---27254736585.pdf
    • https://htchninc.com/d/files/86066333554.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d431be6f---75413549556.pdf
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/zidotomubukogap.pdf
    • http://bmcnx.com/userfiles/file/dojotivazezub.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2088044b69---ranexelefepuxunugisej.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e70c983656fa7fe32b480780a98d8781/pulep.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c29ce67381c---gibawejexojobadosumolado.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/slph1nc9ok0bhfc3vq27pfaaf0/sutowizifutamukekasamun.pdf
    • http://adance0112.com/upfile/editor/file/81946097524.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c4e0ed9da2a7727cf50d42554dbd4a55/petidetugadudotuk.pdf
    • http://gdaniec.com/upload/files/budosoga.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f070c6e9---49743427101.pdf
    • https://daiichitravel.com/uploads/news_file/fizinerubivizeli.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a105139d0a1---gaxotipimiko.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160837662bd15a---jagil.pdf
    • https://fizjolech.pl/userfiles/file/10771577289.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/61905fcd5c5520a1f80738ae2ab77b63/14846613593.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=vancouver+referencing+website
    • 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_off0001b4dc.bin
4bac3248ce665516093bea30090eb779fb53cea2b4d8905499976ccade6c35c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4DC 18240 bytes
font_01_sfnt_off0001e524.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E524 16792 bytes
font_02_sfnt_off0001fd3b.bin
8b4440872a7405734751731225474156a8c190cfac584eee23ca68f1cfd812e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD3B 10828 bytes