Malicious PDF — malware analysis report

Static analysis result for SHA-256 358f47456f9d8de3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 08:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 373e4a1e7dc2f8d6d04d4ca4f350a9dc SHA-1: 1248797d4f96a76d440b678df12050931b5f65c8 SHA-256: 358f47456f9d8de336f46309a215b23c650fd22706ed2127ebabce3700799caa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.icareonline.net.au/ckfinder/icare/files/bewazijuwokafugoz.pdf In PDF document text
    • http://synphabase.ch/upload/file/88648983653.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210901_DE46AAE51F7F4FDC.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/sezinuxumebejaramo.pdfIn PDF document text
    • https://penzion-palice.cz/content/99042128206.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/69517474373.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/rotuzoluk.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/be7b7968caecbe5c51105dd2db864f95/vaburoragimafagubolabebe.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/31303178255.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/mironozerasixoduguk.pdfIn PDF document text
    • https://basisnomor.com/contents/files/kagodu.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/68392845066.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8799176846.pdfIn PDF document text
    • https://fratellifurloni.it/file/lexojofikimogo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131797e099b4---3997453102.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/27498614803.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd518e0e07---tozemugigefozavevat.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/momajapimudulopejavut.pdfIn PDF document text
    • http://1careglobal.com/upload/files/81952457843.pdfIn PDF document text
    • http://vititanon.com/user_img/files/15490175566.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f72fdcfb7---renijetanivegukisomog.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/gasawodazez.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/51692963052.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/bedudejujisoxeterorabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=touchwiz+home+has+stopped+galaxy+tabletPDF 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_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 17568 bytes
SHA-256: 861e549da55bb690dd03baf5eada2efe90ecd7718482c325418ebb40ed0eda7b
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 11324 bytes
SHA-256: 7d46025a14deb6227a053cf1b1dd8375580a427fd7218263af73ea58c83a9933
font_02_sfnt_off00012a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1