Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a1d0706fbdc3c5…

MALICIOUS

PDF

68.2 KB Created: 2021-06-22 14:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c597b88214e83b89196ff8f5382a50d SHA-1: 9174acc417aedd557e6458b15cc875dab8b4f3b2 SHA-256: 79a1d0706fbdc3c5415ab4b0a0a07d4991d1a2a132f70d8df5e19e32a7397e9e
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to compromised WordPress sites hosting further malicious content, disguised as a quiz. The presence of external URIs and the use of disposable hosting suggest an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=company+logos+and+taglines+quiz+pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//35637121686.pdf
    • http://pronobile.de/catalog/file/38058009574.pdf
    • http://vivo-mebel.ru/upload/file/12455277068.pdf
    • https://moto-trend.cz/public/files/fck/file/11128823120.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5e4d37ae73e89408b1fb18f0f973efd4/6306512244.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/09ec90e8a974c4b4e603bc2796df51ee/37266173544.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6a84e32bf---63651882947.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984c99e7812---minusu.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba4b34cd6---87982706052.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb8c4b7ae---suvagapepibuwatilan.pdf
    • https://kurek-rowery.pl/user_pict/file/6728737661.pdf
    • http://kaowei.tw/image/files/20210530_123215.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983c62355c3---fuxuxuxijojegeputanaku.pdf
    • https://terminal.hr/userfiles/file/99616342383.pdf
    • https://aimhc.com/userfiles/file/jowig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bca4.bin
4309ad4112606553c9c71c3326221089f941e699035a93768c34edc5a6716e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA4 5448 bytes
font_01_sfnt_off0000cf26.bin
9c58b25bebd2d7c8417eaa1a0adfa57e300fb58673d3ff01cee029a166bb9eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF26 11572 bytes
font_02_sfnt_off0000f5aa.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 4324 bytes

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