Malicious PDF — malware analysis report

Static analysis result for SHA-256 deccde96846bca1e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-01 02:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 591d47ffcaf71b7478871cff4df803a5 SHA-1: bd2bbb145c24c9f5c6950bd8ed3222446a6733b3 SHA-256: deccde96846bca1e2ea0a0e923e7489e86ff152e69e14f71cbe6eb0740ac31bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=clia+certified+lab PDF link annotation
    • https://nhorizontours.com/userfiles/files/xiwizifibezutu.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/7a318be53d8f89da35ffe495569f22b8/93351036261.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/vojazir.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/32c3279de2c1a1a617cfa6d8f909b84f/nifumuxakezoka.pdfIn PDF document text
    • http://rc-modeller.se/images/file///nemefegifolu.pdfIn PDF document text
    • http://a-pluset.com/userfiles/wugifopixonutuxiwe.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2c1dc742e---nejitaduzekisipifabizij.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160949e11a8942---94145863531.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/77653414851.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/34647520686.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611871d612ed4---30072657972.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00bc528d2---jebibukude.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/gebalemibarodipasoxefini.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/lakupabewebejonuduf.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/figizawepowunukedej.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/artl7ub9r9gerr666a0s33qu22/bizirof.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/6439006049.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/28132213187.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/c65ad0b2ee84fb3b6a5019a5aa6e60b2/49222387077.pdfIn PDF document text
    • http://chikatere.com/Upload/files/28231204176.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/sisagumuvabebumibepi.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_off0000b2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 14588 bytes
SHA-256: 501988e1a10ef37e16c52291de20db51b55d1da7003d90cfa493afeceb05f760
font_02_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 10248 bytes
SHA-256: 9280446f7ed49c276db47a2e503421358e2641c115a537242aa937c7ae9436e4

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