Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ab4a9ed5c42d5e…

MALICIOUS

PDF

88.0 KB Created: 2021-07-31 01:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f37301c6b20d683497a29a5392be095e SHA-1: f273d3e412b09b002eda89aaf00d4ef34053c809 SHA-256: 41ab4a9ed5c42d5efd6818ca6fe2425c4f6d214a64846064299a8f166fb7526a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d4c9b80056c513954decc6e125f32501/69096360864.pdf In PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a689d7157f7be4c06e4166be90f4b6a2/sulimuwefabutufalebo.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608138877ef1e---wunodokafatovuvemedi.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974541c3b2c---gepunanirukufulenupofiwu.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/60700346012.pdfIn PDF document text
    • https://iwistw.com/upload/files/35851879017.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/takufarozazixidujikup.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/givujubavufoxaviniri.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/62632370532.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/bekikifew.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/4d1e86cc74fb1467e8e3c3388d8e2ca0/48655464071.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081b467de61f---tagedam.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/govixofifuroduxevuje.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e60399e87---kizilededurate.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/vafimuluw.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079478a3d21b---49280766432.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/tidogimaxetixus.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/momovabuzukiv.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/66107092862.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a083472d---xawixatojafezazol.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/kulin.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a43654c40---56707979430.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rmsnu0idq2mqqo3lhmbh0ukfpk/80566719640.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/gizakumilu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f9b5864507232995c730b896ad6e0383/gujedafobilewova.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/63869901138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=assembly+instructions+ikea+kura+bedPDF 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_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 10956 bytes
SHA-256: 33e405425b9f6ee16ad5ad1f22451f26599cbe17261abf09e0a490138cf69807
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 18048 bytes
SHA-256: 12453b747cb542ace1e49bf260d80850c6e30efba3f7e57ceb006642a9f2affb
font_02_sfnt_off00013a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1