Malicious PDF — malware analysis report

Static analysis result for SHA-256 878a2403627b2186…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 21:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae2d76d8e9126bee6109035a1fe39849 SHA-1: 1e8de31112196fe757b2f6118e8ea1f3611bf627 SHA-256: 878a2403627b2186fefe26865143ba7e7611a8fb6018974cc115e7d83d55ac54
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=how+to+root+android+nougat PDF link annotation
    • https://lose-weight.tw/upload/files/feren.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906081832.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/jomokisuvu.pdfIn PDF document text
    • https://nasikampung.info/contents/files/18318967620.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/28055901537.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/tofuje.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/sagafulidexewasapan.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/52885362041.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/npu0m7efsfi7rt2uld3o2inn10/81994862176.pdfIn PDF document text
    • http://kvrhousing.com/uploads/85610556475.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/wobutubezaporozomuf.pdfIn PDF document text
    • http://agilesolutions.in/uploads/76158643982.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/90026670574.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/34247671950.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/rixazujurarolisugexin.pdfIn PDF document text
    • http://nemalipics.com/30501503899.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/45889934670.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97989813329.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/84927625594.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/a0mltfoe6nqkqdqt8s6l6smo9j/6721502501.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/99114469005.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/dekejivefukopotabedame.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614346fed35b0---sibewuverefipo.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_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 17280 bytes
SHA-256: 5c66daa0a02e500b656e866ea4fab5a5c05ea9ada8bb530008458191d0d2b9da
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 10252 bytes
SHA-256: c068dadec0157d7e55e9173ba8958e4a3119bfb54846867bd875e386aa8a3bd4
font_02_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1