Malicious PDF — malware analysis report

Static analysis result for SHA-256 33909537e40c08a8…

MALICIOUS

PDF

88.0 KB Created: 2021-08-09 11:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0647e498ac54aab8646a5d3784ae2e58 SHA-1: 5cae4fee7b4c944e34b6218d468f9e25e6375fd8 SHA-256: 33909537e40c08a82dbfd5f70d072f35c4f1b14e8f64905d6d9de4b71171c6b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to external malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=descargar+quimica+de+chang+10+edicion+pdf PDF link annotation
    • http://roxburyhs1987.com/clients/63080/File/zarovozatogola.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gvf117js0e3eoav90n7sdmo4ot/35300484554.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/3142129432.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13de526676---13003523005.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/1d68a9a9132b5eaaa78ba8e6b56a1570/95953075530.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/83845778758.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qlqv6e1pc5rko1gjso289achb7/32690800327.pdfIn PDF document text
    • http://newworldss.com/uploads/file/74119598018.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b4bbfcc7f9a00b1b4cc021db9b05e8c/dopajegurokagul.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160850dec32ec1---95743878382.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/70958214701.pdfIn PDF document text
    • https://apra.pl/files/file/xebapumexuk.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7e7ff558ebca40d534cf68bc255fe665/44880023406.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c935eabbd6---tetewuderowuripaxu.pdfIn PDF document text
    • https://dm288.rs/slicice/file/87480290133.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/43899863985.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/225235075022b24b89d05a1ef4d5e726/63898928046.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c3a011db804f33092b261cc3381c7927/1862225284.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/wumefokunezadosakog.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/dudomutupevi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786efca5c21---vuvobelipojigebi.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pofofat.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/ritewa.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_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 18716 bytes
SHA-256: caa74c9af028cf9c9c91aa3a2a7c0527f5bce5891cf1a7661417956d544daf6c
font_01_sfnt_off00011e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13627 11344 bytes
SHA-256: 84702a8a4972f1a17bf702549a3d656e6f9c48b8f313e10d15438c20ee13f81a

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