Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b85421eab0d15b…

MALICIOUS

PDF

85.1 KB Created: 2021-07-01 14:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c32f7212b4eecd37ab3fce3dd6aea536 SHA-1: dfff95f2db3f81dc4a205fc1e424f79342eceba3 SHA-256: c5b85421eab0d15b8b524f9ea977148c75f83e0c652868f5e7bdb7a269f0d951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm pointing to numerous disposable domains and compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the overall structure indicate a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=enersys+battery+manual
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db2d7187fa1---35810791841.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a53d8e3f---45600295076.pdf
    • http://www.lnk-creation.fr/upload/file/31941116818.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2363328b3d1b75aaf03e00da280a0424/396382145.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609420e4dec2d---6188185192.pdf
    • http://skolicka.eu/foto/images/file/62486842909.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3bad1ecb---81446925241.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3a5ea33f492bff8ccc397575c1e08351/memubutemalemig.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e889754a231cd96bddcd20b7e90df3b1/woloxegeb.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fbf4153dcd8fdfc54d1e7da2485d68aa/42870381579.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c117ffb5883---xunonupazesulinifesugop.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ba09bec0---11741583529.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4satnr7mj3q0b4do8h0eb6it6h/61355344370.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5d020e2710863b9770dcb37afa133fe7/mukavujolen.pdf
    • http://gmei.lt/ckfinder/userfiles/files/sakefanozusanafak.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9f6cf77a9743d204ac690cfc8437c7d5/4506544540.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fb01aecce---zudubojizigepo.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1d32ac807bb85c097570bef028816b0a/genolaze.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e6ab436ed8117563ba91e9c117558b64/25250716669.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/42025410816.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d63592a36cb---fezujijofazababelud.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e7fe2144d2983d82d39b614ce8812ccd/fajefe.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800042f1261---nimogixuzovegadonibet.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_off0000eac2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 16792 bytes
font_01_sfnt_off000102d4.bin
3edaa3a396cb615727c96d8d688075f8211c22fcda9ca25f686cadc54aee2c9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 17208 bytes
font_02_sfnt_off00012fed.bin
34ac975f51a8ce24305df389fb07f8aadd31a711ecb0bab1b81efedbad97193e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FED 10396 bytes