Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6633dab148d5da…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 09:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a2c1912f0d1f3cb186bc93f270f0c08 SHA-1: 4a2b7ee7b0ab2c70fa17055cf25c5de446800d0d SHA-256: 2d6633dab148d5da49ecc1b9ba0635a26327c9d06bd4671203c5b03663f94ab8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern. The document's primary purpose appears to be to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://klinok-saintp.ru/files/rimisekoxozebufenigikoloz.pdf In PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210901_63183E3DF0E56B41.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/68890064344.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/34889488240.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/zepuripevadusixizafigiwa.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/93072087677.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ed47b554d---59332083598.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/43566110793.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/70424860626.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/jenedawuxubumedo.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/puziwadulusesologiwusojes.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/58952552823.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/wofakusediwi.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///gutejovafolu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139302d62418---28359090190.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/3058949240.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/bifovoforegixoxipisesa.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/84023719272.pdfIn PDF document text
    • http://xsjprinter.com/d/files/dijudivemuzafedid.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/91344038032.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/74379166455.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d461655016---butesumu.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/72935147902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bd+phone+price+under+20000PDF 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_off0000c748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC748 17508 bytes
SHA-256: c2fece73b21bf7ed301ac74954e747fdf222d1ff1b9bdfea772da5182f1d9779
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10532 bytes
SHA-256: 6694ee59e01cf5d8d52ede063ea8ff2323a6336a2637365af8c615c5b15b8af5
font_02_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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