Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd996ca3f696e974…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 11:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07eea45b30db7dfa8d05c30e107b773b SHA-1: 0f3f3fc2130d2761bc4aa36d64291b9c89ba93f8 SHA-256: dd996ca3f696e974dad5e4e49b1c05b0a28c0dff655b4d2a7d288b4d140e48e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mt-creativestudio.com/ckfinder/userfiles/files/topidetitidebuzaxubizekas.pdf In PDF document text
    • http://indigobaby.eu/upload/files/76565501613.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b593ab4dee4---2654147254.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/51901092339.pdfIn PDF document text
    • http://nenorm.com/files/files/69290981171.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/21227772919.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160824986c428d---sematego.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082d606146fe---83464585976.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b633b7cf5---34436868445.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/22268482127.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/40469197334.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9893e3940---terezimepanipafelav.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/dezuzinakafodimimaken.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/71445557432.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/83347398386.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/fokipomobojugezovo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b81c6ef49---tokadekuxipolilorozewo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bf17b651dd7---widisebamur.pdfPDF link annotation
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5a47e23d845b63307dc7fe8f95c1a3de/42133155045.pdfIn PDF document text
    • http://xsteelstock.com/d/files/77180316251.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160856b0099c22---natuxunaliwufilupe.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/mituzivodurasotibomawo.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1628398929.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7a999abd42dff9d8ef9c7739ec7c884d/dosajogoxobigoxisidod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=metene+forehead+thermometer+user+manualPDF 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_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 10620 bytes
SHA-256: e1d8e62eafb696161c56b39a7db5cb03a4c56d3edb1c3029af4864fca51d0975
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 17632 bytes
SHA-256: bbbf9e5a8e45b5028b16f1970b04e8405d47bce1601cf941c631eb1094857caa
font_02_sfnt_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1