Malicious PDF — malware analysis report

Static analysis result for SHA-256 646beb08a1393a84…

MALICIOUS

PDF

89.5 KB Created: 2021-07-24 11:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4faa5b85e4ab08954c9494bc86725dec SHA-1: 902a4ad5f3c5d3c6845e86f0a310d82fb329ad1b SHA-256: 646beb08a1393a84907dc208054af7234459878fe05cde4723bab68dee54c0a0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Security Software Installation

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a security bypass instruction, urging the user to disable antivirus, strongly suggests a malicious intent to facilitate further compromise. Although no scripts were directly extracted, the PDF structure and associated URLs point towards a phishing or malware distribution scheme, likely involving a download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://fautographie.org/images/userfiles/files/90626862941.pdf In PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/22316390218.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/31851577442.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076faa714b26---40563821789.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ad23be5a---mipujurofumageber.pdfIn PDF document text
    • http://ktcz.eu/files/files/famadowiwuvodesiwor.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/73644146032.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6mhlfbn7md8r2siu86q2kiuopl/fepifelivixut.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e153e4918---bixoravuwigamozureb.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e1519033d69---2855349302.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8vlu48b5nlr83oeppq5esh75b1/75253322179.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/jomegavetak.pdfIn PDF document text
    • http://iviltra.lt/images/files/juwidedapuveresa.pdfIn PDF document text
    • http://atomleasing.ru/media/File/dageranerugamilimadaralim.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b09cb356a84245f5a8f4fb4f28159dfb/17310553245.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/426242774c5ce798cad76f0980647e7f/kafinigifukevinigibi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5350100f3a52ffab4aede5b6cd95e28d/rezojewafedipufabepi.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/31359601384.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lbjq01t4ofhekgg73ckpj8nmj4/labojuzebezuju.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/vekejitobuvasetepuvala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+stranded+deep+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 17868 bytes
SHA-256: cba5f3932dec22e4393891340e37f9e1444944efe1c0ff215c76b09a912eb7e8
font_01_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001402b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402B 10472 bytes
SHA-256: b0dbcf239b6f59cf84a0467672d3e20150ea5067e076af73159d2edc190ce0f7

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