Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85fb5b5f1ab096f…

MALICIOUS

PDF

87.2 KB Created: 2021-07-25 05:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 850fee63e489870bc495732ef95fd3b8 SHA-1: d83130f66405da7933f6952cb7f342834e49eff1 SHA-256: d85fb5b5f1ab096fec606f52abb72d1ea83e64a8b04df64c8c7eaf64a28af088
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aawyx.com/sites/default/imageuser/file/62255787634.pdf In PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/b68019704f68b4abe2242a316cd136d8/fujogofariduban.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd9580a75---vajel.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/58357991098.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/86645296962.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/35202320888.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/gifotilonifuno.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/91229635603.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4c13c27e1296c81784891fb4d3e5ea5c/gigizugoputuniluxo.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160776413f2434---90804514459.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c2d0b735---60935054458.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cb7063fe883b530701c9055bd0fbbfa5/tanimuno.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-23/20210723103103446230.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/37143435518.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93cb7982ec---tavimo.pdfIn PDF document text
    • http://446888.top/userfiles/file/kubinuxuladukedetad.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/eac1f9df6c8c8e5eeefb67bba1aebce4/68337207397.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/24909144489.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/gizapozotov.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/zutezuzizofawe.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/csdsl4aasam5ll8hlqoc1d5ut5/43555491001.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/jozexo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/r6oibgnnqh0pudjblh4ts56nk6/39681414960.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7c92cac412d4eef67d5bd3b269507f08/13623055528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=stihl+ms250+carburetor+kitPDF 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_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 17208 bytes
SHA-256: 3605d0174ee46a645bee25c7d95ef12243a38c358fcace6d5982f03d2d57f5d2
font_01_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001351b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351B 11176 bytes
SHA-256: 725e4174ddf1a2890f58bac9c1c9d19bee12d6e30a3c762a0da65d6b42c235f9