Malicious PDF — malware analysis report

Static analysis result for SHA-256 4166fbda17cd3304…

MALICIOUS

PDF

85.4 KB Created: 2021-07-08 08:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d48d82aab39bec3972524d593de6529 SHA-1: 73c176a4077c83487efae2df2fd7ee539a2a0f23 SHA-256: 4166fbda17cd33045cd9fb7abaf40b4eeb0e8eafbd0429f3adeca564a85b49f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to distribute malicious content. The presence of numerous unknown URLs hosted on these compromised sites indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9925a2a82---xikedi.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a8c940f815649b623063105c1381cf43/jifinoxamomo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd200e8f2---48151568490.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c884f1cbaf4---loxamafoz.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/fb832hrvb4plc5tgum7spmdld3/pufabakelusufavisubunawi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48eca4dd5---xoxobofefu.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/nasezolofajukegidiwakajod.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/zeruwofemo.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/rhgf88j5l04qi43hr5g3lchnv5/62021273114.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/beweturiguwiwagojeguxud.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/vatajirarorotajazuk.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/77225749175.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/fe20eb4cbc63ea447ea20e550e73e754/fakumizaxun.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47d26e98b---zitaniwiwobejeka.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdf2be9ec7---xabubovobofinurom.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089573b88fd1---71983725330.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/64762662062.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0271a849b0---juluzovoredafijo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/47969528.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7b44423da---vosijawozaratepukatar.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16257163152999.pdfIn PDF document text
    • http://119pump.net/d/files/nafajixifuselelip.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/naxewejafewenoruju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=worksheet+about+emotionsPDF 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_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 10652 bytes
SHA-256: ed4cb40bc5dcc5cd0ae940a387e1eacc40da6e9c2a2e960ec067d56901649d2f
font_02_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 16656 bytes
SHA-256: dfc0510efe01cfb1441547bc47d13210d74049789d30304136e45ed40cd3a077

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