Malicious PDF — malware analysis report

Static analysis result for SHA-256 7565d39e5e0e383b…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 07:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4ae02b21e8c8987087735d15b64b27f8 SHA-1: 09d286f0d085454f7391f5593182ecdc84a5e3a4 SHA-256: 7565d39e5e0e383b137035c5636e5e2a26f39fb939c074851df04f041d62c552
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting. The presence of numerous URLs, many hosted on compromised or suspicious domains, strongly suggests an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://gorisum.net/fckeditor/upload_file/file/61288884488.pdf In PDF document text
    • http://rilta.net/userfiles/files/65808421964.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160819205a67ae---zuropuse.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f23e837ab4ab4fe43cf3beeeabaac890/femufovotiredekuvugeni.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853b16272---24429785945.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/91611440247.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/79090552019.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb7ab8c74---soriluxu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5hvevg27fa96s9e0mvr2dero2d/10908516253.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210616_305451ADEC9A29AC.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2dab734cc452e7600f0430c82cee075b/romowanoda.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g65vaoatrjq6alam54bjf1h51q/didiberudetagupa.pdfIn PDF document text
    • https://epiphanych.com/images/file/wepagujinodojokoxaziduva.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/4lerikehivt4snglt5l06j3glm/bafitananupeb.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/33d0c63956389b119d567639fc22bdcc/57114801522.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/nofusegeviboradixiveb.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa161bca6e2---taruwugopoluvupumaten.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093a75c51ffe---36644325706.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee25b097c6---81256268904.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae69e464df0---biwotumu.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e3b5ba7f514ee3b4061500d66891fe09/dodegopogoxuxubowurem.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/xuzilujevuwixe.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba6ae49c12---87785612202.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/c59a50020c5833f101ac27d8b5ffec1a/8749954197.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/8m6h1ogspubmj80plk9b7nesjn/komolodudonusegurof.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/47820190844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=floral+butterfly+tattooPDF 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_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 10172 bytes
SHA-256: 0c1091d6b95b1eae050166c722a31977216e870e84b8f43f36c239c9a997fa41
font_01_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 17836 bytes
SHA-256: d1ae94b98ae15bdebcda83447931c9de6928b0f3d53956d4a6c0731b022cf44a
font_02_sfnt_off0001346a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1