Malicious PDF — malware analysis report

Static analysis result for SHA-256 385024c56dcb7005…

MALICIOUS

PDF

73.5 KB Created: 2021-09-26 16:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 996b9b3a1f3e5cfd8ccbfba39453f98a SHA-1: 0391271be18a5ce52b8aeacc3555aecac676530f SHA-256: 385024c56dcb700539859aee8e9c2b4c8e9b2a4f3b36f65ca6979d1a80959b39
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to lure users to malicious destinations. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern observed is the use of a link farm to facilitate phishing or malware distribution.

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://drafthe.ru/uplcv?utm_term=igo+apk+cracked PDF link annotation
    • http://canhtoanland.com/upload/files/jawirej.pdfIn PDF document text
    • http://cabini.it/userfiles/files/19746590368.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145475a9b052---mivujilikonepaxijuli.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/ragibatabolutegutazagizan.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/wefotaxubelo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d624754b8b---tulafudafegutifid.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/2533701743.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/xulifonajopefo.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/rafawotikukowif.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/liriwofitalebedakelasovo.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/xajadagatixumewadeven.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/91545564825.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/77606087256.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/68576131150.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/zixebowujizasipa.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142cfd4849ed---kobuzofamefofinasuta.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/94614016449.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109211606113539.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/gikovetizez.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/74530474661.pdfIn PDF document text
    • https://servicepapik.ro/files/galowemomutixituzevuw.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/mobelulava.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/fonukujatekafetav.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/53162730437.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_off0000b864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB864 19232 bytes
SHA-256: f8e6c23d35e884000699e62936dd022c0a959ae50aa58e2f401fade2f02f38c2
font_01_sfnt_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 10224 bytes
SHA-256: 3e4448677bc6e5534745823295735456861ffc291f7bee33eb4b0349c6b68bd8
font_02_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1