Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc38e6891509e2d…

MALICIOUS

PDF

96.6 KB Created: 2021-08-04 19:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d12ae2ecef4f196eb5b5a50da0d5daaf SHA-1: 154decedce0f7ca91c22e755fd0dff014a8a01ea SHA-256: 4bc38e6891509e2daa134ee5be8aed8185054fdc3475cf0414b646d15b38a48f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://inwebjor.ru/uplcv?utm_term=cincinnati+reds+scoreboard+stumper+answers PDF link annotation
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d35267e005b---ponesutulejowabixinodox.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c2c032d8b46---kesefugavot.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/teruteji.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/fag6m4r1f3b7tu0cvj969ciobs/lopetusixovif.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d22f63e2dfc---dibefegadegipuvovi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27e00d395---14387487807.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/nikujexuditoronevap.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/pomenudukonelepuk.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rixed.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a921f26b7019229acb1e0294008365bf/29723399118.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/b2ntvim4ee3audf06apqclqbl2/lukadukefopidal.pdfIn PDF document text
    • http://kudusde.org/resimler/files/30245156480.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/fezinakav.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/js2vod5dkevmp9722rgqg6tnk8/fezal.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080036776c00---19514247380.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/kivigupoxufeguxototij.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a6af2ae0ffc4c56365107fd9b7147577/zegolejagebiruw.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16098c57d77c51---rixopifedosurubunule.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f7392192b---28314948443.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/74b63faf592867cbac9d4a9726f52ade/57157177114.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/58873516484.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc32f5b65c---tujopuxulisidarize.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1624385530675729941.pdfIn PDF document text
    • http://apvn.info/userfiles/file/62431790427.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_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 17348 bytes
SHA-256: 06c2d6c5ad4790f302681d33789cd7c22894016dc2775943e5785e5d97641687
font_02_sfnt_off00015a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A23 10988 bytes
SHA-256: f08f5d124d92c802c7eca0a8c2779d9717e6acab5eb6771d8f39f28840257595

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