Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e4be63b0069668…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 08:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8512e794e4c464d88735c66144337ee5 SHA-1: 8c467118c5e8d1418a0bac605677b0c06db03c25 SHA-256: 53e4be63b00696689bc07d8039e3ac35e04a2f10b51c6d1c478667d8915c896c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://irlanc.ru/uplcv?utm_term=top+10+rpg+games+for+android PDF link annotation
    • https://pcparts.fr/ckfinder/userfiles/files/wubokeritivurewiwewune.pdfIn PDF document text
    • http://hmed.vn/upload/files/tomagume.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/nekopakumilumujep.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/68741058216.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/60982945449.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/bawenuwajenunuj.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f2509a61dc5460b418f95421f839bff7/senowas.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/49241331188.pdfIn PDF document text
    • http://capri.lt/userfiles/files/57498654436.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/46351601707.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dejobaboxuzeseki.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/mijavajerizufobasuzu.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/96154611044.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210916_596099D0C93D0927.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb4249526---44575351158.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/62940099695.pdfIn PDF document text
    • https://polandpools.com/contents/files/44934696696.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/tajorafeloxuvoridudojube.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/50127141800.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/76332377812.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/90309720990.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/cfmfk707i8gsoq888dv5jka547/sotin.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/19552370465.pdfIn PDF document text
    • 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_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 16936 bytes
SHA-256: 8663d22fd896f50861637aa3976018e479ce557557b12ca915884e4d57fe3eb1
font_01_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 10832 bytes
SHA-256: 71a5fa7adaf2b00f447b3ead11960b5d9711f92554d6447fc1879da6438d170d
font_02_sfnt_off00013804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1