Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bbf1cec4f7708c…

MALICIOUS

PDF

88.6 KB Created: 2021-09-07 18:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a9077ba439e578ad10d09542aa9f460 SHA-1: 411add1d6393ea3e9be91453caecd6b2802b6b60 SHA-256: 31bbf1cec4f7708c4a663091f438f58edaa0840b55ad7f4b1c24b455b58047de
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document attempts to trick the user into executing commands, likely to download and run a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=router+configuration+pdf+download PDF link annotation
    • http://birzebbugastpetersfc.com/files/file/vodazagigelati.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/darexuwaxuworiketa.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a171aa67c---panukekasolubub.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/libunajavozizevo.pdfIn PDF document text
    • https://svltv.in/userfiles/files/84605388050.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eb41591f3---92445583823.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/13706793010.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1fc7501a6e631ea0f361bbb5826c49e3/97892722723.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/dasoroxogu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab782926342---gaxuviwinulunad.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/xanogegetagod.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/doginepugivo.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/somobasafa.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91cff29adaaab30d4e2d8dae5904ce4d/xamazidiferelerobowezo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/n22mc64p5mm9brj6rtrbsd8j30/dokavelefiva.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/90989384037.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/lovobazepitetanixito.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/gakaxo.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/78323673715.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/xizililexazivaxenisosexe.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/32160254558.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/53927742724.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/13492969754.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7881f664---31374448005.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/paxipuxezojafu.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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 10860 bytes
SHA-256: 2167f536fb113e088de0d96fc09ce5e9851de37c49fb891b0f13a6b2b184044a
font_01_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 18100 bytes
SHA-256: af03b6f40bdd4f75bcf3e76c615d91f3998be705c8872182ebeba9c67de65b9c
font_02_sfnt_off00013c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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