Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f9c4080f9c9435…

MALICIOUS

PDF

88.3 KB Created: 2021-08-07 02:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28c45da4d7964142477a947c0d77c9a2 SHA-1: 9faadf4f1082d7fe6247b3296e53641510e8e41f SHA-256: 02f9c4080f9c943520247e4afc7b1f1097b052628aabb1776a00674531b286dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of embedded JavaScript and the link farm structure strongly suggest an attempt to deliver a malicious payload, likely a phishing lure disguised as a job resume. The ClamAV detection and ML classifier further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://szakkepzosiklos.hu/upload/file/33597470801.pdf In PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/dazifidik.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ov8elbfgmdrci1u2iis4fgpjnh/38036454258.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c530596cd1d---22226216623.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/xepapuluwubajozipelemep.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e650567f536---lewuwazoguxe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e957709a8---77856767019.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/9538885719.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f74dc352bd141c996aa7b33a0e90a720/47107645281.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/pinil.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/97283648829.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/xekamizuxisatewuledabik.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/1723672914.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b3fe87cab---zosifidepo.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/678699882.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7822b1083d---69196833271.pdfIn PDF document text
    • http://splogservice.ru/content/files/15709065133.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bec8d91443d---jemes.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hqaooa72cam298l93ebcfncj6h/poluloginef.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/jotejuzid.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/xilalunafiletizel.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/081217433590.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bf52a377931---87753564830.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/taliwo.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/30672422559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sample+resume+for+first+job+with+no+experiencePDF 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_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 17320 bytes
SHA-256: 26a73cab9716798a7662806e21a65324b2404bde1ef6e7ec52916220489dd4c3
font_01_sfnt_off00011e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 11380 bytes
SHA-256: ac4f6d8ee270552ff616054c6d3f4920283d12fee73b7d75c29e26c8595a57fb
font_02_sfnt_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1