Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4944a40311eac6…

MALICIOUS

PDF

70.5 KB Created: 2021-06-27 02:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8606fd25a61e1beeae70d6d7f3a598c SHA-1: 793b9ff8cc93e5239f7c106eabbcb00fa3271bd4 SHA-256: ac4944a40311eac62c660d6aa8028fe107059e7fdc8fce5c3a06ab7df3a52826
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://coretry.ru/uplcv?utm_term=square+yards+to+meters+conversion
    • http://colescastle.com/clients/875019/File/mofofa.pdf
    • https://perfecthospitals.org/FCKeditor/file/77225121421.pdf
    • http://firanywiktoria.pl/uploads/editor/file/dojigisofutibovep.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f32e888e---58690548947.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cf0291f1---lulisegipupirokomavuvo.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5e17f82c55e234f85171cea47343af7d/8801091427.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c176c8cac---welobolape.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/pps3t0f9cbckrea3m3qc4rgusj/gomexebisarupuboniv.pdf
    • http://domeinbeverdonk.be/assets/files/file/tiwur.pdf
    • https://actorconseil.com/files/file/93659478392.pdf
    • http://alarcon-v.com/editor_upload_image/file/nuzoladamelodosemofid.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bl616hllm0bukbe8hrnflb42g2/32347338920.pdf
    • http://beastyenergy.com/userfiles/file/sisazekasulejefazuv.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e2e891eb6---10147522398.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/99abf67808519037679b9e1379d6d79d/55423225331.pdf
    • https://newtech-utm.pl/userfiles/file/64208764118.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5dc17a59addeb1a4dc7c601a3e18f923/33170165388.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/79a08f83f907a16d7d7b6ece9ec6ee81/97797393226.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/98e506a2efc664326816aa7ff8ef1d5d/kanodumusigezenilajafa.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/q1s6tmqqed62oa877gor27nmup/58087330126.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/5292ce6f0dc08556fb7f26b696f9b28f/22268440532.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4c431abf75485574a9be1e8b85427c06/janum.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/pigki7luf6c3o9mudoaa3mp1ss/8672916618.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160826e0e40c74---xigavulogagenifomevig.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f0484a63---66256688162.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_off0000b663.bin
7039fe81eddf250cc1f3cff8d7cec32cb76fe1d5be9f732c756e0dae05a5e091
pdf-font-stream PDF embedded font (sfnt) at offset 0xB663 10988 bytes
font_01_sfnt_off0000cfc0.bin
c75cb3db1c1f5b68dae38236b7f4f44e8c67389f068ba4392f3be172f08c38b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 14692 bytes
font_02_sfnt_off0000f4b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 16792 bytes