Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b513a929f7ca6df…

MALICIOUS

PDF

81.8 KB Created: 2021-06-27 23:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e1e5b25ff175dce8a20264d24da3b91 SHA-1: 3f61151312fb20c3a92d858b4768971eac425969 SHA-256: 6b513a929f7ca6dfeef2a235952f1eb17f87633c399596c4fee1b76b031f1717
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links likely serve as lures for phishing or to distribute further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://bscsaoner.in/ckfinder/userfiles/files/parikukekomuzumil.pdf
    • https://congchunghadong.com/uploads/files/52960517092.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/015e71a2f9c33ec7a4f80c74d04c16ed/16371624511.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c9ca217fd---bixubelusavakib.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb932689a---85503390785.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf64cf2a8b---14246923936.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5cc961d5ecac85237f426427466ed535/63057817301.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4da7d90f850f28b93398b7602b3b40bf/wituro.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7691mu4sb80oc6m9hvjbombnne/34404617666.pdf
    • http://anandtouristcorporation.com/uploads/6424821777.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c8995b201a393fe4733abdca2a6b9a3b/rizoduwugovavokemuxun.pdf
    • https://alatheir.com/atheirwsfiles/file/36983000787.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c873814203c---kegimawetomakewexatasokul.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc03a17c6c---35914378498.pdf
    • http://asiavent.com/UserFiles/file///numenolobudujuju.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609facaf094a3---xefugegidutiwaxusapola.pdf
    • https://africanresearchcenter.com/userfiles/file/gowulewemivojijazanagiw.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6aae84f36afc48e6ae07eff673494b53/xowukavorefa.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/40179053933.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=initialization+of+pointer
    • 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_off0000dffb.bin
b7b1c1356bd2382f44c3c5726b92d55f6e719c0772e013113d44c53981b00b60
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 16692 bytes
font_01_sfnt_off00010b7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 16792 bytes
font_02_sfnt_off00012395.bin
f315068cbe43b14ebf8af39f6d6fcfe14f0fc5ac6db41822d88d7c47c14d3b00
pdf-font-stream PDF embedded font (sfnt) at offset 0x12395 10196 bytes