Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a50ad0a7634d8a1…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 14:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06bab92ef437a8bc30a47844f840e0f8 SHA-1: 2eb95b34075171dedbe3b30a31e6e8e0150a89db SHA-256: 3a50ad0a7634d8a1701de7a57e84e82ba2045555a40c95d30637ec3e85eafa01
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, some pointing to compromised websites, and exhibits characteristics of a credential harvesting lure, specifically targeting MFA or one-time codes. The document's structure suggests it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1584b29fd2bd2998a620ae7c7c099ef0/69652815444.pdf In PDF document text
    • http://gramercy-grand.ru/files/file/lafunopidinewatu.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/62259650947.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/97054150285.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/jadomizuzez.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/kiwirudofekolorovin.pdfIn PDF document text
    • https://tomas-music.com/contents/files/bujobimekikesevurowiroki.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/birimivodemazogatuma.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/wapetavakozu.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/82231969567.pdfIn PDF document text
    • http://thaifilmind.com/upload/files/vuvaluruxumibevoti.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210905181922.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/84128954587.pdfIn PDF document text
    • http://epicridesnepal.com/files/93625716768.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1d65f406694d8b53b9158ba5903c417c/42727427378.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/31999038805.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/26229790050.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/bamalojofevupobipe.pdfIn PDF document text
    • http://rsentco.com/upload/file/158886228.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/fatitikibigi.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/karuwogurivaseramomamo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7d82fa6a31d9df004c5b46c61cd65d92/bepiko.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614583af3f272---98254176008.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/mibol.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/3130935267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=valid+credit+card+and+cvv+generatorPDF 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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/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_off0000bf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF73 10412 bytes
SHA-256: ec522bfeb5f87cae62369674873c795ad5a5c52de64a0a5c671317bd24fb93ef
font_01_sfnt_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 16596 bytes
SHA-256: 0c4d1bf0ab010ad64cab10e5e69499041ae5b15d2cdebeb2e9bcaf023ae207ad

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