Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac0c409d079b79f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 08:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d09f666938c146b973986f32a9d2a47 SHA-1: e34c6baa64f31f21c08cb19e1af3333cf9cfe975 SHA-256: cac0c409d079b79f2260f578f49d3a32b88d5cefdf658e7ae6bde13671fbf883
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to compromised WordPress upload storage. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic suggest a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd223118c2d---42171630483.pdf In PDF document text
    • https://bestcoloringpages.com/userfiles/file/peranumex.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/19/36938255836.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/279772928.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/be340365cac2586152efcbe11da731cf/28409067441.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/tebodizaletoxowawa.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fr72g048pmilj6r56osd49treq/47470822456.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7df900e53---55884442599.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1bf6b3d1d1363f40996e9349d987ffee/verat.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160823c8a396d0---77664364646.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c242d9d5ad3---54622421193.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xulujukugaxilarujelamo.pdfIn PDF document text
    • http://yuli-china.ru/d/files/mubetijonevoloruvomu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0c29bd057c9660ab4ad2a533ccd27629/99616195846.pdfIn PDF document text
    • https://polytex.de/sites/default/files/49271952203.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/wesotujuxoziso.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/25778768078.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/71035919396.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb99aa3da---73399156696.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/14929078046.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/liwinebevozebabuxeful.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e3599578b2a3027f609ae29dae8fad96/58048219968.pdfIn PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/19838816113.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b7b6d1715e5f85021a426c67357bc6d/94618271710.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9bf7a20571a201e499781a84975a92d9/nowuvixozufujuxara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=praise+you+lord+lyrics+and+chordsPDF 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_off0000bfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE5 10584 bytes
SHA-256: 33fc81106bd64df8c2101cb29ed89fb6c11f0800c4c1f52a10cb1a96c85a3d43
font_01_sfnt_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 15804 bytes
SHA-256: d81b009ddb8a03df89ec7e6cfb58bda795b46de2dfec83ed97b87c262e81960b

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