Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e96e3cf666cb29…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 17:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7fbb5785b03128937bcd98ec96b93053 SHA-1: 1bfcd3704f874c2dbde7782be08ea4d90707c9e2 SHA-256: c0e96e3cf666cb297a2dda46985f8a137fdb6682d4441aae1c405e723903eb95
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised or disposable domains, a common tactic for hosting malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maysoi.com/hinhanh_fckeditor/file/kasiferex.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5068221f5---29315380791.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/zapajaboru.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/vapif.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/56677320677.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/meroninoka.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/luleponilev.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/patavuragitegideza.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/fadakuzelovesuxe.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210917095659_54lgse.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/17736812500.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/710fd08ac91e9a03fd9f667a833a4d45/55089792166.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109160924394094.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de683ec72---20573606828.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ac20c775753124a3cc44371af88f07fe/98592721053.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/8567874311.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/2f846fdfd0e12f2589e83f47bd8c4ccc/79914254923.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/68221074573.pdfIn PDF document text
    • http://annabarons.com/files/files/tekejodokoxilatuwesapala.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/29025198891.pdfIn PDF document text
    • http://firegallery.ru/img/upload/43966220977.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/83799530264.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210909_20_52_35.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/92737469298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=data+counter+apkPDF 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_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 10252 bytes
SHA-256: 789a67d27d98146ae79911e2fa6ebed9051e66c0b33e1adcfb9239e309cb0241
font_02_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 18744 bytes
SHA-256: 91c2cc635b8a4bfc4044341a54e0c8a604b5ac2165e01a0e14a0a39934827f6f

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