Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b928614fcfee4c…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 07:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96fac2e58b7b9e3d53ad104004fd0533 SHA-1: 5e5fe088f40d1cf2aa239d591026927f7664f039 SHA-256: b7b928614fcfee4c0dc95faf89922b6199f76a05d4aa4dabd861ac17351323b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, which is a common tactic for phishing or malware distribution. The presence of embedded URLs and the PDF structure suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9cee96e1e8---40426431247.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ef939602380cedc35b99a3c3c398fec8/luwijerolowasifezadaxa.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a758de5c28b---gowoduroti.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/50662955184.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/64917568047.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/xivupizonevujebijewojituf.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/zoripobamekopupozetozo.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///88923594073.pdfIn PDF document text
    • https://tekartltd.com/upload/files/69222833580.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/gowowaroxaj.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9a1a12bd3---74835252422.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/091d03e4a651e53bb491cc77a0befdf0/sonovewufakerixozamow.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/f15d400624128af80e8f25fba5d326b4/7691973495.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/wusiwi.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/53309365339.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4706339cd---61356521607.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/87392121441.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/39146555574.pdfIn PDF document text
    • http://agrion.org/upload/fichier/39635826937.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/ruzovipuzebipi.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107052052.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5ec1de67ef6768309a26c8e8a6d24e3d/16513815166.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/48375022042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=asahi+pentax+km+manualPDF 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_off0000b7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 10572 bytes
SHA-256: 61ef97faa3cd74d425313f1be78e9a750bec4787e915186d59bd64a137c0325e
font_02_sfnt_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 19492 bytes
SHA-256: 2634bf011441fae4ce0dca05499a9975602adc88cc264e2a1c9df1ec8570c176

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