Malicious PDF — malware analysis report

Static analysis result for SHA-256 167d69d8af656807…

MALICIOUS

PDF

132.2 KB Created: 2021-06-08 02:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 79610e543ba8290baca9b53617b786c9 SHA-1: e1ee6958bb8d024fe1264755890c8bc30da1be2f SHA-256: 167d69d8af656807d2400486a3251fb550805e628df39c014e0c0be51abb1bbe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://allytemp.ru/uplcv?utm_term=what+is+baggage+inventory+sheet PDF link annotation
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/780404c29fac7168f65991951ac5f8f4/69073942213.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/wokadoziwejapoxodago.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2695341489---37151295264.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/2c26afce702a4d07c286ffd49cf7e8e5/36494588209.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160816fd4cfb89---39947128018.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/da4c3d5b10690b0c2dedcef213cdc306/pajasejoxuwejesogazabafi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/025178044bc90a3a84b051d99e7b6af3/welefuzeselit.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/30238466898.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/h21lnto5asf026vrtrf2mjvc3m/tatumurinumigide.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/63785826e09d311815f19f5fed20d04c/93464858373.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/15099544874.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9uh099r718ugcen2e22fq7qhkh/64501174153.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hkie05f2jk4fhm81fjuaukpc51/87807632001.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9b4978db---15111646591.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a7b9e743---jepaxifugizovikutimekin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CAC 5020 bytes
SHA-256: 7a159e98d362f0b2a33c55bfa894702a72178294d60171c81d37d6023397cfe1
font_01_sfnt_off0001adb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADB9 2128 bytes
SHA-256: 1e3d9f03e13be5600862e68fad9b0a5f38ad1a675b7f8de2347a2e5a3d2df69f
font_02_sfnt_off0001b6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6EB 11412 bytes
SHA-256: c1bf6d2561cb84e91fb0293ee82dda065f0e2ff41e8272296a515c49c8eed0fb
font_03_sfnt_off0001ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDEB 16136 bytes
SHA-256: 40d84cf9fa28040ad633cc535bab8b1ea6201c7147e2b8dfd0cfc85331bd8fdb
font_04_sfnt_off0001f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2EF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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