Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7507a06841f998…

MALICIOUS

PDF

82.0 KB Created: 2021-10-15 00:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: eb23ad867783c4ed81a9f0505d7f32e3 SHA-1: 6727327fd674ec98ffd0c7dc1abd1ed3cdce6db5 SHA-256: 0b7507a06841f9985329f66b3efc5afff34f6e4d734349f9d3b73ddbd6a3f2aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://malopolskiszlakwinny.pl/upload/File/64330257277.pdf In PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/45938161333.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/supisumojulimuz.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/goxofereforifala.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/36694658676.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453a5f73cb3---xiruwovep.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/62218085883.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbf3337bc5---kefuvidevujow.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fabc81a7f---8150139801.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/koxeritekamakapuderax.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/44128382959.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/45261771855.pdfIn PDF document text
    • http://imi.vc/upload/files/zibutopeterujevavabi.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/mazujuzarisenivigagod.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/kajorefufezugajosekojolu.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/zosanuxozifogod.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/82691418383.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/zusajamogeniremuv.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/wovorezuneguvawixemijawot.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/ruvosikibozatobotabefi.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/ketisivevuwobolusukut.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/zebenibupaxenunekidabesak.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=190+inch+whitetail+deerPDF 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_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 10512 bytes
SHA-256: 52de281c96bb64964c4a2fb2e1b3a1d2e5f66ec66b935553f50ef0039ccdc25d
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 17888 bytes
SHA-256: 15e4ba4c236a334c621c99e620df269513a41d54d74379689c6581ae0d2d379b

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