Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a1e5f0a83e34f7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 10:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6eb4e91259488cd7d43a5ebaa73608a0 SHA-1: 79e99114f3f43b60cbbea9356654fed098248234 SHA-256: e7a1e5f0a83e34f7e72ed9254bc4083c0aa84c1a2a651b13991723d1ff4ee66c
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. The 'SE_CLICKFIX' heuristic suggests a social engineering attack that instructs the user to press Win+R or paste a command into a terminal, likely to bypass macro restrictions and execute a secondary payload. The numerous extracted URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content or download further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://archism.ru/uplcv?utm_term=err_proxy_connection_failed+android+mobile+data PDF link annotation
    • http://studiomistretta.com/userfiles/files/roxosupugorukukexelekumu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2a24a970d1aca0d4f8ae649c1eb91031/79511079891.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109091150218311.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/rexaxipomafemenokozidut.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/rikije.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2bc64bddb18a3dcfc222ff3ff5a482d4/36021547409.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/50687841219.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/kugupiteze.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vafifewosifareniliwipi.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/48749666841.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/4531917495.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/tezifaje.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/dabuzawogikesimon.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/89116687818.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/11324841755.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/bovajudefexufipija.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/fufewexonokoxekifemexe.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/dalugoganukuva.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/25316359588.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614427d881813---53669796702.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/1575512435.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/texoroliwedimur.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/xanirapugixanadibogipo.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210916202349.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/tajikenodizasudizezawuvud.pdfIn PDF document text
    • 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_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 10984 bytes
SHA-256: 640c90c9acf03ba54cf8df16694d199408588c335721b72fe3c57a98c11390c1
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 17708 bytes
SHA-256: 0bf7405ba1c3a0f9b44688513b4668f6b81fc16ee5c2f73b5d5ba577463408a3

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