Malicious PDF — malware analysis report

Static analysis result for SHA-256 232b887089976532…

MALICIOUS

PDF

75.1 KB Created: 2021-09-24 15:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b2ee17b45ef1151d38d3b400bb8bbaf SHA-1: e879221a4f9d3e75c641c6cf7a0979fe84ec0767 SHA-256: 232b8870899765321924054cbe93adfcd414cb6de0a81704848e6d44b470ce25
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous URLs, some hosted on compromised CMS platforms. The embedded URLs and link farm structure suggest the primary goal is to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://guitarenko.fr/img/files/95948915267.pdf
    • http://baggiez.net/userfiles/file/43084427968.pdf
    • http://educasters.co/ckfinder/userfiles/files/fusot.pdf
    • https://sanidom.pl/img/file/xepofa.pdf
    • https://nedimgame.com/calisma2/files/uploads/wefedegisukigamar.pdf
    • http://gpsputhuppally.com/userfiles/file/33611534920.pdf
    • http://aurora-c.jp/files/files/19759974660.pdf
    • http://torby.kbo.pl/ckfinder/userfiles/files/58899973160.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/knp4cv6eqm1j7rfgso8rujruq5/49096729276.pdf
    • https://weldingportal.it/userfiles/file/99014410507.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/rizivuweredegeruv.pdf
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dopip.pdf
    • http://accutindustry.com/Upload/files/20210922121659.pdf
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/takusewunisomix.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed0cdaddf---37881360899.pdf
    • https://responsible-tourism-alliance.com/content_file/files/11406056055.pdf
    • http://autosoftware.company/autoresponders_images/files/44948676286.pdf
    • http://tasteofruraleurope.eu/upload/File/45140796002.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/zerom.pdf
    • http://accessiblevehicleservices.com/userfiles/file/98623769926.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/78786b03406d142f11fcdec75cca7c72/tivodumaxakabetase.pdf
    • http://sdv.sk/userfiles/articles/file/zeliropeti.pdf
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/roziwowufelirotet.pdf
    • http://allivecoat.com/userData/board/file/61129278975.pdf
    • http://skiflogistics.ru/userfiles/file/siwibanavusunilagegojudof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+can+i+find+deleted+videos+on+my+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB47 16792 bytes
font_01_sfnt_off0000d35e.bin
331b007d36e0b08de069e44da8971cd0a172625306bf0d934bb487f681473a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 11044 bytes
font_02_sfnt_off0000ece6.bin
ff3ef1a589e09e15c9f713695c2dff681b9ff9df50a15fa06ba3ecd8dbf68576
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 18940 bytes