Malicious PDF — malware analysis report

Static analysis result for SHA-256 98256efb974d8129…

MALICIOUS

PDF

73.8 KB Created: 2021-09-03 21:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2e4feceb080bb346ab31f3339df7b10 SHA-1: 865fa5fec93ec6a3d8c308f0781f86a0132ba066 SHA-256: 98256efb974d81298fb6abda942a119b4d04b536b21dd5e3020ded6b54ad34c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://atasuorganiktarim.com/upload/ckfinder/files/xovamizod.pdf In PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/2566179526.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d888dbbd1d48ea318a907c92036a24b1/41684451635.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612860cc68a94---19946271356.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/vekebefadilog.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/zedokosebujaxix.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/wifeda.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4dcb161a75f20e6c1442341481f07fc5/mivanewiwo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b8de73cf7---34707003157.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d983503402c---61199699223.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/55511967678.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c401a30f963b8a9e5490f67ce690b3d8/kerawuguxogivexo.pdfIn PDF document text
    • https://nada70.org/userfiles/file/pubexu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/eqb46cau8d95je1vh4a8145s7p/gamibidozoduneb.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/mm5p8lno4j763l0ob2o0e1echu/xuvasejiraramub.pdfIn PDF document text
    • http://langmypham.com/luutru/files/ruxobozujefexit.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c15ff6hquvh1m0ieagimek9804/fusikatubetur.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/nuborujaporubiwas.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/vezetenen.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/61312376820.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6ed3e4382460ebd47c2b2dac33eac607/51902161758.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077272bc527b---42906756143.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/fipogekalibuvipudugivosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=muslim+laws+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_off0000be1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1A 17240 bytes
SHA-256: 732d69d8b4b23404748fb654b633489182d8f836b74a78dbb6a4f60d4f2c6435
font_01_sfnt_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 10284 bytes
SHA-256: c8e12d02109a36e7e4625e536a323868a023d7139a6bb2906c118b34ef6cfbf1
font_02_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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