Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebc035ead95c1f3…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 15:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 893215f744c60c5b7ea59da05351f960 SHA-1: 9c0e1653b4c157fb6792ab5841d22dbb6643cd3d SHA-256: cebc035ead95c1f399105ab4d27e8c5b3f40e252b64d07efd1953d300815b83f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links. Many of these links point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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://pixomot.ru/uplcv?utm_term=activist+theorist+pragmatist+and+reflector
    • https://amrapalispot.com/userfiles/file/bexedenevulodubujo.pdf
    • http://harnettcountyhba.com/userfiles/file/75054299989.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3e611ff74---54481969413.pdf
    • https://bepxuyenviet.com/upload/files/18591696553.pdf
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/74816904041.pdf
    • http://dietetyka-24.pl/images/files/wukabejinewagotekudewo.pdf
    • http://vladjurnalist.ru/archive/file/ruleba.pdf
    • https://pet-fashion.ro/mm/file/dufamomagogogonapovo.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/monoralig.pdf
    • https://legend-chang.com/UserFiles/files/52653704429.pdf
    • http://smartwealthhk.com/userfiles/debotepimujifujamu.pdf
    • http://heorungminhphat.com/luutru/files/97380835583.pdf
    • http://chetaomaynganhnhua.com/uploads/files/77767958249.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7361047e3---pedizil.pdf
    • http://turchifiltri.com/userfiles/files/sapumofilemogovarite.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5080015d---pifajujun.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/pureteno.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613258e125906---modafevojudekuwewuti.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/tupejunezulawuloxitukiw.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148e72f2b532---zuzufapaj.pdf
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/77907304875.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b083.bin
73148b013f8da63630f6e60b6a45eedc6e4a42989a690babcb07b6a28de08be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB083 15700 bytes
font_01_sfnt_off0000d868.bin
89c4f8e0901ea834eaa8ced5088953bf770f5842b0dd9c7c8472171134cf94f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 11116 bytes
font_02_sfnt_off0000f207.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 16792 bytes

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