Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a02868c61c2fb6…

MALICIOUS

PDF

97.6 KB Created: 2021-06-30 16:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c938e703d8de41d426f3aca447ccca2 SHA-1: 027e332f93fe4ab364e757d25169b2477356f718 SHA-256: 40a02868c61c2fb6bfbf8c21d5537298adb1d75f4f008538d06a5a87af7c58e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://infrive.ru/uplcv?utm_term=my+hits+top
    • https://hosvagyok.hu/userfiles/file/diruj.pdf
    • http://allasclub.com/campannas/file/poloj.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ochjskisiqbc8bmpbfs703i6b3/xofedebazefu.pdf
    • http://archissimo.eu/userfiles/files/7046351689.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f74da48edfb824e096b089ca7b535af2/14231602727.pdf
    • http://gleneaglehoa.org/images/file/33556375955.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a06e8a1a281---tupivubeni.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/423a23df75a8554f323a5587451b9d48/60604938854.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a361ffc3307---zewuvuguxinojusevad.pdf
    • http://prmakeup.com/Image/files/warivewavemod.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742be2d0257---supasibedugid.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9aeeba963fd91995b2efd75fb5c899fe/50733378347.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c90459f1983---vejapuv.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bpiog9m0j5q285rch3h28arlba/tixorosapotig.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf35b452da7---webebuta.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/54434323415.pdf
    • https://vildmarksjagt.dk/userfiles/file/22186139377.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba0774a3cf---20075753259.pdf
    • http://chinajnbt.com/images/upload/File/181256867.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/e4069703a13e52ec7d1beff77d17c369/jonenariwuzugul.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/84452616857.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e0c79fb27---xijoxolatu.pdf
    • http://kartywspomnien.pl/uploads/assets/file/nowaxe.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/effd94ab68b92568aadf4807c11ee48b/pizokulomigurasagaradejel.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080aafb30647---fenedixawesutaku.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f565.bin
8589c165ff27b231d5426113b97d5d2a91939d86f6b0395916a22be720b23eed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 5092 bytes
font_01_sfnt_off000107d2.bin
f1e8aebbfb63af6e6b4f6a30b0ab785010073cfa4900e404a01fec683069421a
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 30708 bytes
font_02_sfnt_off00014938.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14938 16792 bytes
font_03_sfnt_off0001614e.bin
7d55db9dd92c1f84bd3ccd3e81511c4a5880d374749b9f6ed17f562898629717
pdf-font-stream PDF embedded font (sfnt) at offset 0x1614E 9912 bytes