Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ec4638ee1c18f1…

MALICIOUS

PDF

94.1 KB Created: 2021-06-29 22:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 69bbfaded8a64ae5facede8105de4813 SHA-1: c3b6fd103a40857e372af701b39d5a6bc222579b SHA-256: 75ec4638ee1c18f12966f6754fe0e93b3a662d64ae31d15649fd4af6faf45813
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc1a143c84---2624760911.pdf In PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/2b664ef637b71dde54712b5b18dcc5e0/lifikiz.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/bovomelejunetol.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/skqt4rknarstigo060mi89gajn/ritugezi.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/gakudapereju.pdfIn PDF document text
    • https://chp-travel.ir/data/file/bogodewesu.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/relavulimupu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j9l5mp71p16jdjqr4hj1qjfef7/pomavesedaluk.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160743ab538d97---33526396857.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4sm6440qk3fslitmji4jn5mttf/wabagiwulukaxivodokotafix.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/mokukepefobigi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf3cc0802---felojux.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a6cc8df3---jojefejag.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/kikata.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738b59c209d---22452601384.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/sufisirigujiwefoda.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/e83df52ea85cfc78468dec370ff3a462/lidupudigo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160809758e6918---53651490020.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/7075900820.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6e75897f5---40600289765.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bd343e2eec4c543b4b78d6c7838fb649/21154284332.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fa28ef456d31b862dc899a5e0ce093ae/56910401735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rose+queen+rage+of+bahamutPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 17700 bytes
SHA-256: 228d6a8788392a64bf0c0c4b2b331d3ce020bbd3016e6e45c956a0622e92d076
font_02_sfnt_off00013377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13377 10952 bytes
SHA-256: b476e8d94f5e1536fe2b853f0e695ae2db63519334a07d5256b860cc2660b269
font_03_sfnt_off00014c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C62 9240 bytes
SHA-256: 797d06900facc5470940176afeb1aeef273156444b4148cdfc567ec7856e7baf