Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eefc2543e6469ef…

MALICIOUS

PDF

92.7 KB Created: 2021-07-26 01:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 35e90b77a071fdff2d3b387859861327 SHA-1: f809e97e7c6b60aec4399e98b05fc0eb82fd2601 SHA-256: 6eefc2543e6469ef571edb0692572e42ddb3f0676fe28e0e15805497fc80452f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/20e1cjful2405n1rn75h7k002k/1064504329.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/992b0a685ba9ba0ca698b14a473d47ff/32928950524.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b132f1f506---12258425098.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608941a86834d---38270825056.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3445c522d1---71251327846.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1cbcc2adb712bcb642df47812ea2270f/72178428874.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ad3cac0c4c70b02da142e99df6c35d15/pupawazusarifinokufafe.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608598a770053---216090865.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/tezosaxu.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/4mblan6dv4nci3gksek52holq3/19000700984.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/juburaxudapi.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/49033114713.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/bilabala.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871bc5ea76e---29538841804.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/9217982959.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/28961230593.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8ubrfga95na3ajk5m51hm1dc16/44247131603.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928764719f0---79237368021.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/85598494285.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d0e04269e0621feef7f46bba14f98179/83080345600.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/073a46i4rkfp431qu77qechhj6/28609380404.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072440bbdfce---rekeretijotovewatituni.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ajgj6e1s8gc8t35nvkmhmd612v/dudizifalogab.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb8ae4bf86f---fifadigutuminoverekisu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748dbf3e1a8---34440290321.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/54106764170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+economist+march+14+2020+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_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 11172 bytes
SHA-256: 5c65f3ca4d636b1c6d462492721a1df121a36b63c1cc175d5ece76f36926d9df
font_02_sfnt_off00013632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13632 18048 bytes
SHA-256: 0216d7b7d10792fb50cbd7d509ce6a99ed1e0d6b7b2c8bff15fd12d88ce71e2a