Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f52edbd7f05c39…

MALICIOUS

PDF

84.7 KB Created: 2021-06-27 13:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1301ee4c6dfe6605e8272010793ae3c2 SHA-1: d8b62a0aabddbadaeefc4dd3a61ea6f948920e08 SHA-256: e6f52edbd7f05c39a3bf05e7b2ec22dbe4c8e997af05e04495ccda380b488898
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e283c51b9ba1c33074bcf259172b6acc/86361657287.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607127b37701f---43236523840.pdf
    • http://gd-weimi.com/upfolder/e/files/20210613012115.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/vobirot.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e920439efd---tuvedadememesok.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1650da0c8---99178823029.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/lukevifobox.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/46f3cb2d15009f9bf3b83976302f1032/74638725390.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/uf6apa1qaa1im4fdtmva7djoc3/gejojuxonejo.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9f5f9438277374bc72d67255dcffaddd/lufanutapunuketiw.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087d0fb6c4df---xaxivaxepira.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/vemif.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f989ec8c5---guwabaripozopigewe.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/65d775e2b16f61be076765ccc85eb776/98509064338.pdf
    • http://stacjaregeneracja.pl/userfiles/file/kivutatawudutobudujipuju.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089913231bfe---pemenuxomubegob.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8ee3087fe0060bdb32f48f811651007c/newenozoxagofazu.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/bf07db06eed5bc2d6e1a5288258d59fd/88173681775.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d24b22e1---weriwuxarip.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6e78fc137dacbb74b6b9a946bd2a8e4f/bezuvimadure.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ecb8acd8d782291a2ebbdde3ef296d10/zabemerakafowiwedop.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4a79dc48---febufasab.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e619c53a9b---konuvorogoja.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e967cc3b4---podapajak.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f126c491f3aa4e88d15daa5c84fa5ca6/xurovabenasozovuvofani.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=rs+aggarwal+math+book+class+9+download
    • 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_off0000e675.bin
2f1b9e812b836703aa4f3a82977d2e430dad924511d608a01b9d4eec026a15f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 17228 bytes
font_01_sfnt_off00011360.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 16792 bytes
font_02_sfnt_off00012b77.bin
76d315dcc87af43467f672c9cd48894b03bdaa4f09118c6148dc2862940212d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B77 11124 bytes