Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84bf3f6e2f162c3…

MALICIOUS

PDF

76.5 KB Created: 2021-06-26 04:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95d1396028a13927662c8e9cc74ea41f SHA-1: 9cdf1ff22f7d64a067948cc7a968b5202898b33d SHA-256: e84bf3f6e2f162c32ff8231d4d86faf966411d329f3dcdb54a0d6ad2696f614c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://epoxidice.ro/mm/file/83907733947.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/m9krmao1q243fcv51frkspq0hh/xijazokiratabudiwe.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/87e1272480cb132cd9c2ae1747550900/detif.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098baba8ec78---wisaxudokenudubujodawena.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3fff3ac1---wajokenibumog.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d838ce5c2de4f9d34f6a54f45746439a/11629006932.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3ad1dc7d2b1646a14dc26171d2d522e2/tawulegexo.pdf
    • http://cablexconsulting.com/Upload/file/siwazozikilub.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/h8ofbeoreupsqkl4k6ftmbsbk5/73522772529.pdf
    • http://abw10thstreetne.com/uploads/files/15173506757.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/sonajizesiwogexoroxolina.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rvhk285g4o06l6vvupgfausun0/pogavulibiza.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34b6ebff7---42423276692.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160873b589486d---rijobov.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a672af93ff3---69215702808.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087359eb7337---33095498506.pdf
    • http://cablexconsulting.com/Upload/file/8410144666.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/20901911011.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/6c38f6a288d9731aa0ab4751833fd194/65377160020.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608553fe730af---nigufozidej.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b13a65279ab9ec1a83643625168023c9/16075633418.pdf
    • http://jaatkinson.com/userimages/gogejefiwow.pdf
    • http://vom-ragnaroek.de/uploads/file/bigal.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf9280a84---batekevugironenuwunudisu.pdf
    • http://www.niziointerior.pl/upload/file/38586072099.pdf
    • https://securityguardsupply.org/php/uploads/file/kivirudozorumufepubafi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=theoretical+and+applied+climatology
    • 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_off0000c7a7.bin
bbb71de8051eba8dc0c030be329057c184048d057c0a40ca040f0e4861650d37
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 17084 bytes
font_01_sfnt_off0000f3bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16792 bytes
font_02_sfnt_off00010bd4.bin
0f4410f3196ed83e47bffb52c08aed97357ce7b724d1324a81c0a78017411894
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 10872 bytes