Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e8d3b96cab959a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-21 18:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6f83ffee114d73499efd65cd959005c SHA-1: ea61deb914c9e639140bea3ebd4bc56b32074ce9 SHA-256: f5e8d3b96cab959af89773efe045cbbb3a8f905c8cc3eaabd550a858e85df530
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and a link farm structure strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=spring+live+wallpaper PDF link annotation
    • http://lasermedia.cn/userfiles/file/dawajinumedasapobunida.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237cc3da40---nekatotukuxamum.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c923aa42161285429c058d08ad26c542/61838532118.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/24897191612.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/sokutodosegi.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/43906241907.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/67829670144.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/xowunibawubirotef.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6771bec9a67a8cb7fff12d872b716580/18067154216.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/42391040019.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/japipemubebuvugabukoxem.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a17aff42925fae363c4d823c6355c0fc/83375295739.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/makowonojinixa.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/lizibirajawatok.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/zotedumalewigif.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/84938244711.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e9d0adfb85c343fe5c675c56c6f0938/91313265529.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/74936653113.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/14848669274.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/57814713327.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/7868502366.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210901_074554.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16131d51d0727d---volevebezu.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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 21828 bytes
SHA-256: 86b35320b35145f59090b313bd915670a329021d90e140f0f0cfca2e9129eff6
font_01_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 10268 bytes
SHA-256: b08896c868c3fc788c33d24b7cd0dedda8460336b24ccb928162dfab8465b8cb
font_02_sfnt_off00012cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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