Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8dfd8f7ce53ea3…

MALICIOUS

PDF

74.3 KB Created: 2021-08-28 02:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7739edef55f104e87dd05dee4376beb8 SHA-1: 9169e047e1bbf13b694123f9a47424ee84c500fb SHA-256: 9c8dfd8f7ce53ea3e01e811eb5abda2f455ef1a803aa442d2889ae7bdb96da5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a link farm pointing to compromised WordPress sites, likely intended to lure users into downloading a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/gogit.pdf In PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecda539483b---55493119708.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/81363677540.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c09ded0c0699ca10ecb58f5962081bfc/31355897426.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/favixuxi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01eb09e922---77986941944.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160987a17699f6---fixofaromo.pdfIn PDF document text
    • http://dentali.cz/files/files/puzajorutavosiwugaxo.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/dunixuzowiso.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/87529711021.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/gijuzigozo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160785685317b9---150293126.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/7875746157.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/78900974701.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/50405574409.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2ccc18668---78085307470.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/niwafigaminojoxukuvomo.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/gifuwixul.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9gn2oe388iim5qo6pacsjkq080/56380914202.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a781d2fd4---vugodabesuf.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16076f951eac5a---vifowudadodujuvidere.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c719605d3a9---bijigolusojevotika.pdfIn PDF document text
    • http://stroi-sistema.ru/img/93285757134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pdfview+react+nativePDF 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_off0000bdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 17696 bytes
SHA-256: 54621c4ae6648a52b106c0efb7ff3df77b7a4b0f7b194a78d0e1c9f249fc3a6b
font_02_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 10288 bytes
SHA-256: 3bfec12061f5d832a13f2b3d6beb908ad678839cc4dabbee4e279bea54dcd466

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