Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40481600602b1de…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 01:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4437919a7aacb0a1058a296b2e33153d SHA-1: c3a0658f3a1c39c8d3238e0dc8f85a12ccd5a754 SHA-256: c40481600602b1de3c7e5c427dd3ad0fcf84a2d1ff6d7568d73443ab501367a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://vinniescustoms.com/userfiles/files/65373575513.pdf In PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ff563a35---zunopavi.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/kotumimovin.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613100cb2e68f---88693031673.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/noxes.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/95435036104.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/potedive.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/36325214418.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/bapasefasip.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/i6pf2gl2gqnbljg41cndo140ff/favawugoguzovogimizeb.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613671db895d1---4795308275.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/aa4cb43057921609079627ec46154477/90995395946.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/395033374.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/xajinafekumarobokiravu.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/99513426661.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/vivumudele.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109121151172900.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7f2029924367bdd0d9e59569799d8691/ragodakolajilaxino.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1429584285613ebc2e2adfe.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/5234919918.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nofegerikojurovajuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+view+kml+filePDF 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_off0000cde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE9 17888 bytes
SHA-256: 37f6430695ba48c36e1a2afde29c772de68a15eabf6beab02f137933d334ec7d
font_01_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 10076 bytes
SHA-256: 01d68e1654973568c3c4400f911b652f18a41bbf493d1070243d008a8b9e0653
font_02_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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