Malicious PDF — malware analysis report

Static analysis result for SHA-256 641b361ec44afeae…

MALICIOUS

PDF

84.4 KB Created: 2021-08-18 23:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 517485b5eb90593ad2695465ee637ef7 SHA-1: f7e80e1b43fd09c861c1021360d88cee27f4a37f SHA-256: 641b361ec44afeae04f74a8fe4b70614f8b81dcf684c5e6fcf85a1e454877979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, often involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://pistant.ru/uplcv?utm_term=loveshhuda+full+movie+hd+720p+free+download
    • http://www.siscbolivia.com/admin/uploaded/fck/file/xasulo.pdf
    • https://fivetc.vn/uploads/files/roxaxuximanizowab.pdf
    • http://praguetransfer.com/files/file/babopeget.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609769c7adebd---59139408827.pdf
    • http://hodori247.com/uploads/files/10313873414.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1f36cd56a---mipokeb.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/59217480143.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b60b4334---3185870023.pdf
    • http://ecilingirler.com/resimler/files/98203363092.pdf
    • https://betenenergy.com/sites/default/files/file/nupite.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/b2jenokvheovvpi90d14hd2r0i/86200113762.pdf
    • http://vimbark.sk/editor_uploads/files/luvujetidedapuzubafupi.pdf
    • http://szao-spb.ru/images/news/file/25832866943.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/75857180215.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/773004a652fab67338ce3e582bfd6f10/97919689527.pdf
    • http://ancient-theater.gr/media/file/zigiwifekux.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/c2mcv1fu5f8ih4lbvl4dhvs1cf/rumapozafole.pdf
    • http://quaint-house.com/11457220554.pdf
    • https://aslimitada.com/userfiles/file/94578093709.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4be3403cd---72124189094.pdf
    • http://ashokarefrigeration.com/userfiles/file/kekamigep.pdf
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/bujakomojexudobak.pdf
    • https://airflow-skateboards.com/upload/file/61919119505.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0d6865f4---13079643031.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b2245c46950ee6adadb2b9e4e992bb22/duxorolusujojarozevuzud.pdf
    • http://ozkayalartrans.com/userfiles/file/70155898223.pdf
    • http://qlinairnv.be/userfiles/file/sufumelejuw.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_off0000e19d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 16792 bytes
font_01_sfnt_off0000f9b4.bin
d1d43b317807993ab3bbd5df2b7544f1df9324dbc0fd0f33e4aadcc34f203c62
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 11168 bytes
font_02_sfnt_off000113b2.bin
f48d3878bffad1c34b55740c3673e43dc28aa662263c0fb674f7d2cb141590a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 18236 bytes