Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ac9cde5e2bfbed…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 23:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3072638bb6d8eedeb07df6f19522bd3 SHA-1: d832c85606594535b546ea013b95d68f3b069941 SHA-256: c5ac9cde5e2bfbed65d9e182f711dc4f1209f56e2f852ab1831e320e46b5337d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing lure, with numerous links pointing to compromised WordPress sites hosting malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to trick users into downloading and opening further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609452699f801---mogakatanoweretilitevam.pdf In PDF document text
    • http://studioingegneramato.com/userfiles/files/52519812215.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ae31b8c2---64753251915.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/81893407836.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c088076a0---milajenesinuvato.pdfIn PDF document text
    • http://popmetre.com/news/files/tatuxuvekuvix.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/fuwepiditelexopivoturipok.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/36290069620.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/mojofirewiz.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nimutiwar.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/61491528932.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/69376311731.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/vafewobetegege.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/73582452571.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17e8630d0---77192128736.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/44353496307.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63d14befe---vukabevobiguloninonago.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91560949868.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/xemowowidudirole.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/melotaxonoviwom.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ab0e8ccf6a5fe4c44509121c91e0ed89/6033255859.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/pasodonexufegujulona.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160748fe72fe74---fawidopepozorujenuxasun.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f95eeb874bba39ad347740c5d735ac02/deposez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=poetry+definition+in+literature+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_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 18172 bytes
SHA-256: 48e6a00607536c8639cd38ec233fce0f0732c72b39427f71db8fe3bec91139e4
font_01_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 10540 bytes
SHA-256: b76b283cf3295aa85f8160177d120475861a964eec9194d256b859194e1c7845
font_02_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1