Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c8500409b7e7bd…

MALICIOUS

PDF

98.8 KB Created: 2021-07-06 23:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30aa2140f27cdac9d8afacf76992a22d SHA-1: 976600cbd42c6705978afaab39e662911274df01 SHA-256: 41c8500409b7e7bd645cc3dd71018b1894297c637cbd9637d8fbf5c3d6e718b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, including those using CMS upload vulnerabilities. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://delaneyllc.com/ckfinder/userfiles/files/24727436821.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6261b97603f12af1c9b3ffc5f9fb4815/99847570370.pdf
    • https://itexpertdog.com/upload/files/93489126590.pdf
    • https://marosme.ro/hirek/file/6491564515.pdf
    • http://bioscipublisher.com/files/upfiles/file/palilijipodakejumax.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49c4693484---lumemasadavane.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/gjm60dbogbjsblcfmj8ajv8els/79843352950.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7e9e4f78c---99637096411.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/81148074532.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c2ba0380a---91818637561.pdf
    • http://scro.ru/pic/file/13605240438.pdf
    • http://appletechsolutions.com/userfiles/file/86701822498.pdf
    • https://unosms.us/userfiles/file/mivilowuv.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43c662d8d---24708837143.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31bd5295e---15996087560.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/1cf7a5473f152c8580508bc5de10973b/ginureg.pdf
    • http://myphamlulanjina.com/upload/files/78737886096.pdf
    • http://vietthanhstone.com/images/news/file/66865376284.pdf
    • http://loadcell.vn/Images_upload/files/21933751029.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df3cf2488c---jotunaxijopoti.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecaa8705e3---90898409593.pdf
    • https://ludifrance.fr/userfiles/file/95347313536.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c07bd9e31fb---82445607787.pdf
    • http://aaaexpressac.com/userfiles/file/kositixajowasekaraluraso.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5af7fea274---20089116879.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hurt+and+lonely+quotes
    • 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_off00012199.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 16792 bytes
font_01_sfnt_off000139ab.bin
bf577a5ad2fb4b2fcb1d316f8a0349a8ecbee0883831636212b317b019c8347e
pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 17412 bytes
font_02_sfnt_off00016655.bin
ee7edfdd85c7cd21972bc97fa388e10b48e6826ebcc474f593d4e0818b2550b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x16655 10500 bytes