Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bf6fc0af98714a…

MALICIOUS

PDF

99.5 KB Created: 2021-07-14 01:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9829541ec3481d7caf520a55ff2a798f SHA-1: 08160f1c76bbb1bef51d4183a4a9079c8877c6cb SHA-256: 14bf6fc0af98714afeacc4919bab1fb8db8079cbb153684d037a262f5738f872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting or redirecting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://laborke.ru/uplcv?utm_term=different+mechanisms+of+membrane+transport PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ea8465255---35581674563.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/83634205087.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/10spikh00oqu60r67gbia67ae2/97815085705.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb945897d---37028916490.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/95907846098.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ac66d68bacbc6bc47927f33894d3dfb7/zenodujodavanasejuvikizav.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/81854011794.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/22756626448.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f980707c4e---95070712900.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1a224715---90584790392.pdfIn PDF document text
    • https://designclarf.it/file/4380233972.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/16908619513.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/62453370678.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c9b5d846edcef967caac0c456e643e9f/gekimexopavosojad.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/4b81888c2b9ba062276aed56d9573079/92482657866.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ac047429cd0df38982b67303c166138c/79470127082.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925b8214ba6---dizexujabiwuporine.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2be5954f8---kosemuvejotabejewonipida.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160820aca69eff---41318233995.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/58867391456.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90f9dc030e---59638043387.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/guxipuwajarotojesoparu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217d02dc59---18160773220.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_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001387e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387E 10840 bytes
SHA-256: 3032b82d5167d7768cd5370d5449ece700ee32f576893e434fe8d9d48ee120c8
font_02_sfnt_off00015117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15117 18236 bytes
SHA-256: 5238a1907ee742bbbb8b2eeb663be8fbce7c863507b82e17e3104bbcc5dc74d1

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