Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e73e9e1901785c…

MALICIOUS

PDF

146.7 KB Created: 2021-09-03 20:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb73c309d81c1b634d61dfe6ea9251b2 SHA-1: 46e945dcda3e0a9577849b940504002f6aed4b5a SHA-256: 79e73e9e1901785c11e275658dcdc957ca813f779b61965e1da0ed143eafc777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of external URI links suggests the document's primary purpose is to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pixomot.ru/uplcv?utm_term=the+world%27s+greatest+speeches+pdf PDF link annotation
    • http://ash-graphy.com/userfiles/file/52552265606.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/pajenimiwidowimakanu.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/kurilo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cdb09d3012---sepikavofese.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d7db900e8---47048164234.pdfIn PDF document text
    • http://bushurov.ru/images/files/11099935892.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/gokebewugike.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/lexewupenuwuzujume.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hv8jjije4c4jckrs5cn756v6a5/defirofivalezojubiru.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/xodiboz.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d0eabbc07---71692405261.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/36965984248.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/ckf02qs0qivu00249lrnugrmlb/jibenuvisagagisop.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/cqqkerggadhbghjs6eoj220cb0/wozokivomijotal.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/24437397525.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2002a8ea968c1229a8df152798ab070f/rowubegele.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/sunomigu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/78ab1434d70e3a1023754cf3a71e9765/51094820080.pdfIn PDF document text
    • https://wittnebel.dk/file/gefedakaretepawasusi.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/k086prd2r75109cfr4kfu3e9av/fomoduzomebijawarup.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/berogeredane.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/89844929540.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/17369355188.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/64371917299.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f62796446---poresuzemekit.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_off0001dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBB2 18372 bytes
SHA-256: 915317f33d9065411024a9e6b1e980c641023c8cfdcbf092f323f77d05858b51
font_01_sfnt_off00020b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B2D 10788 bytes
SHA-256: 72663657d13292e7fe33fb09c43ee56d985da1af5a43c2ba09b7d84e94caf7ea
font_02_sfnt_off00022420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1