Malicious PDF — malware analysis report

Static analysis result for SHA-256 df76d2b10b0eb980…

MALICIOUS

PDF

108.8 KB Created: 2021-09-03 17:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e6a56ce503d8705e0b1d13caaf7e348 SHA-1: f21beae2015eebe151c554a829fe42028a4bd0ae SHA-256: df76d2b10b0eb980bc3c53afbe05291bd6c6413e6ec76f13a6d71b17647f1b1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic further suggests a potential scam or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://dambi.pl/userfiles/file/kowojozizesanivazedawema.pdf In PDF document text
    • http://kleinschadenexpert.com/userfiles/file/3845366167.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/modidiw.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/6527303623.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/nepejasuxikog.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a32b54e5b0c8caf7115bb9bacab07d30/48955702720.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/kokisoroguxejaxenefuxuza.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1c35ba0fc---19347714625.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/12114766413.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tesabudezapo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9c362688eb14e4b99ecec3ab755bd745/gagudilulitukuv.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/fimilapenufopiwa.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/64480943332.pdfIn PDF document text
    • http://garderoba.sk/images/_file/79629825637.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e4b9654b354f81f7831dd4828893e27/66315096303.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc957cafbd---wunepejinixewumed.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/bagaluxet.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/49536711852.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/dca0266609450be2332f4525d8c786a6/48455368173.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d67b9af346d---86940453803.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/47085685965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bibtex+cite+online+pdfPDF link annotation
    • 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_off00014337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14337 10476 bytes
SHA-256: a5e91fb88c6c8ec88def0832e0cbca51032768446e3a8c2e44491335ca9e81a4
font_01_sfnt_off00015aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000172fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172FE 19088 bytes
SHA-256: 9536c46f461ad59775700f7902306e780c2e4ffbd22008359661e7514d0a5e6d

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