Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8eae8a2bc7dada…

MALICIOUS

PDF

86.0 KB Created: 2021-08-09 11:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5c1fa05c89d5f6023e609adaa70f75e SHA-1: be4b19d12570649f5e988a2900c73d672efce81f SHA-256: eb8eae8a2bc7dadad205de3485a2910ebd9fff834b3d480d6561b8898c2daf8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gamaconsultores.cl/upload/file/40110373056.pdf In PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/p5mbajlv68o9j62borl2nq96e0/29747692838.pdfIn PDF document text
    • https://blogsma.com/files/zugejekovoxarifili.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd493cbb6b4---gokojiraxefizuva.pdfIn PDF document text
    • http://ed-union05.ru/files/file/situwakizedibow.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/52118822204.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/valorfhpvlrk8l0bssmdh02ek2/sasonavadatuberiwowupawi.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/bonilezajozarij.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/84218606569.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ce53773a843---vigab.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/76201712520.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/48198679908.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8502c918b3---sozodixowabewetusazu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6b76341095c37384e093beaa0d07e30d/19897282528.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/vezuwijumo.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/36b29ce54bcdb75c1d9434e91f3a382f/71342462249.pdfIn PDF document text
    • https://mmszke.hu/files/file/28006770871.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/zutukoxixebiwipa.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/grsj22m34r6brftnu73aqc0pg6/wifin.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/tebohhjd9ic3jcddeb2fu52ggd/gurivebajeruxibutid.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/xefuxib.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd639cd43ce---mafamomo.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69d85faec950170f6cffbfae78041707/vebaliluzaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bioqu%C3%ADmica+biolog%C3%ADa+molecular+y+gen%C3%A9tica+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 11564 bytes
SHA-256: 55e87e497638c22ce12d7bb35d57650b7bd7a20b0edad5d603abdebc690ba5a1
font_01_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 18412 bytes
SHA-256: 1cb0d0cb2570228730d61c5482862fe3f277edf581499ccbec912c5da62904fe
font_02_sfnt_off00013443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1