Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d855d8faed56189…

MALICIOUS

PDF

92.0 KB Created: 2021-09-05 18:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08e0a871d3e5ab414fadfa491e49cb3b SHA-1: 135a5b12f370a93344526edf8b5b2025f2f16374 SHA-256: 7d855d8faed561899ae2a71173d3a2386285848f161fe2e898ab8dd339f95e3d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or credential harvesting attempt. The critical 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, likely to execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://garglob.ru/uplcv?utm_term=mcafee+dlp+endpoint+manual+removal PDF link annotation
    • http://bukharageorgia.com/sites/default/files/file/gowasarevibig.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a4da400---wisosomajulafejotavev.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/tuzukiwosanevekijivujudig.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/92737503320.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1de397f0f---nazekupanimimemaj.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6349135986a3566b0c15f09bc537bf89/nupirovatarisemekaz.pdfIn PDF document text
    • http://proxima-design.cz/files/file/58788658123.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/19752709729.pdfIn PDF document text
    • https://airbays.com/userfiles/file/birubepamezugenaboku.pdfIn PDF document text
    • http://sdes.in/uploads/xojisi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e88c6ec6---pumowutuvewopu.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/72603725746.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/fomoliliduluz.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/88dc36b77aab27a5c372d4ecf64c2aa7/1202208430.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/63vik57s07joht3j7onhfm6ago/61350121414.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/83761861007.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/69050401467.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df80c8d6c---nuwilewezevixo.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/88684620342.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/bc2ffbcce21c7fae24ed102c5845d6bc/26153011069.pdfIn PDF document text
    • http://aa-nusd.jp/33234418272.pdfIn PDF document text
    • https://spacio.hk/attachment/file/86348355937.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160768a6bd21c3---80259309698.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/19323467003.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/kanabogup.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/51481603032.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_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 19016 bytes
SHA-256: 06dd0429dc95de9897df7089c98bdfdb5efcab4dd8e62c2bdc0faf374f66bc1b
font_01_sfnt_off0001316c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14983 10772 bytes
SHA-256: eda2c550752d9d85c5ef09e4ec295a7ab34933421b1332e1aa72d96b6697af9d

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