Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f339271c5a2dc5a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 15:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c45ba655b3cefb17f9021997b71cbff1 SHA-1: ff7bb9e06c3d38dcedce1d6d7be80f2ef664e113 SHA-256: 8f339271c5a2dc5a9d08182a8a0ec9d779f40dc1afc122f8a6ec654873526c8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or malicious content. The presence of external URI links and the classification as a link farm strongly suggest its purpose is to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=kinemaster+mod+apk+for+pc+windows+7 PDF link annotation
    • http://eaas-journal.org/survey/userfiles/files/69421298727.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132d09b4445a---vetenosesanenodu.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/panexorudavax.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/67427374833.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/696ed97b014f926ac80886278cd19a4c/76476203699.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/ramemuwexaferufege.pdfIn PDF document text
    • http://rts-3.ru/upload/files/34903623218.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/zudumexirimadagelupesil.pdfIn PDF document text
    • http://npas.ru/pic/file/zasomotosazaluzunaxu.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/81415008779.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142506d4e408---lotekisanufinejewinujol.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/27464680030.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/lenafadefokuxusata.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210916114736.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a9c3c691b8bcea6849fbd504c5137fe1/69029007041.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/53350107789.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/vosokisuwipu.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/475999713.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/panenebolibunafokuwavikus.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/titikisi.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/01/file/20210901_185045_143.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/66389548390.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/pebesusokukidaredinu.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_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 10952 bytes
SHA-256: f9c4fb0093d730a6851e36382be0208c029eef01ff80c744e30e8e2f91234846
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 17908 bytes
SHA-256: 9d1a532defc1e02b1a6758f4493e47134484f61e19bca791b2c876da2ad84fa0
font_02_sfnt_off00012ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.