Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf7beb15fc000e9…

MALICIOUS

PDF

101.6 KB Created: 2021-09-06 03:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc01d58b83695d426dd5b4bd3c76ac9f SHA-1: 16c5f7908aa79670daaefc056a25120f2474098e SHA-256: 1cf7beb15fc000e9b4d3b6d283700dfc80047fd74faa29d212d0d4ee36131263
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, including a link farm on potentially compromised WordPress sites, suggests an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://toptenstudy.com/upload/files/BodyFile__60DAEC24947C5.pdf In PDF document text
    • https://mimpi1pusat.com/contents//files/93830948074.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b762ae87a4---30384345979.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/wunumak.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/25867438953.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/6179u37uiddje65084j5edfrk5/25326433854.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/susidibajepeveludorafere.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd238054f7---repajikolivirogorinanaf.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/058844481.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/59361215698.pdfIn PDF document text
    • http://ned.ru/uploads/files/babuna.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/tarabize.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/28952324691.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aff01653297---98256238795.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/sapirarivujum.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/lezeje.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/92947891031.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d32cc72792e6c83f7f5cbb126d0d0a74/bafikiz.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c55f0a625---kesezejipavasesoxozuda.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480e1a58fc---54366938002.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/jevewimiwufabuje.pdfIn PDF document text
    • https://maturana.cl/upload/file/fomixidiresa.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/jafubomogowulutisefepim.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/9151537098.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/jeguzuxaropovujonako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=birgus+smart+voice+translator+manualPDF 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_off00012848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 17744 bytes
SHA-256: 00f4497c35581fd964c6a1391c7c3a535d61cbddb7ceafd686512006b0448783
font_01_sfnt_off00015685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E9C 10792 bytes
SHA-256: 376a5ff3bddf9e43cbba94bbff3ba21387ec7da63694c514f0d3d9bd882af639

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