Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9e39b6fc0af283…

MALICIOUS

PDF

88.8 KB Created: 2021-09-05 14:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e5e1a91ef6534d7deea0ed766758cc7 SHA-1: 169a9b15e9bea36c1ad099c51e692af5d2ffbdac SHA-256: 6b9e39b6fc0af283aa221b5745754397356b5ad7b7d3a0e0924bc87b33779a48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The presence of external URI heuristics further supports the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://tunesistudio.eu/userfiles/files/tagodasilizujakilakiz.pdf In PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lovofutofezasen.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/kemipikubojabi.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/85178358780.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/rajogelomisig.pdfIn PDF document text
    • http://indemo.pl/Image/files/gixibuzevazizazadu.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/46209574299.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a3af52b7cad---81300116778.pdfIn PDF document text
    • http://stevis.cz/files/file/tudapob.pdfIn PDF document text
    • https://kuepancong.com/contents//files/32571467282.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9439eca94---togufobitolazedid.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/katudofomax.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a0da49a22c76b2fe5d6171f0959a1927/pezudef.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/53667950433.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606da39156cf4---76777245073.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/200f7de83ec7697cb3f7c5b1e907d8f6/zufetaximifagizafefijemob.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975c9edffa8---52516426997.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/litumevutujot.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/33074897488.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/c47a16cc85dd00c72b62f830de798ce1.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/69804042785.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/9901815805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=rockworks+16+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_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 17800 bytes
SHA-256: a4b759d165e37b10100db57a26dfe788c17cabce829422bbc10955369d3d69d6
font_01_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9A 10612 bytes
SHA-256: d8a784d794850a77fa85cdcc061e457d8e9fec4b1aad7c88689f284d99317604

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