Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c004ca658c510b…

MALICIOUS

PDF

74.8 KB Created: 2021-08-19 06:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfed57541b7f62f60736492272467e3f SHA-1: cc49c956c2aa10f0fb45a26d1d29b659804fce3e SHA-256: f4c004ca658c510b5891408fb6934dbfb94791dfaa126d22e0fb9fdd515c0733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://infrive.ru/uplcv?utm_term=kandungan+minyak+kelapa+sawit+pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90881f61c---befarupikuneguwomipadani.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/84299366287.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c608ec0617b---jigifumu.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/boloxamevefazibanixupidi.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d1b487814---74478732571.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd48ce1f197---diwodiwususuwe.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b4164e5ac---vemiwafoxanejoleragitu.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c914ec3c17---95900136010.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e7f0419db---jateranasikel.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210810_FE26F02F2AFD8431.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2a3c60ed573a07552528e3489cf02bc7/niximore.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/8591082338.pdf
    • http://irths.com/upload_files/files/24376613356.pdf
    • http://funperm.ru/content/file/92685349295.pdf
    • https://latework.cz/soubory/fugaxifunutinuloj.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/verun.pdf
    • http://yomamasushitogo.com/uploads/files/topesezavidetenagejun.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ed4690127---tewejetadopuj.pdf
    • http://ombs.ru/uploads/files/85048409054.pdf
    • https://muzeumkonstancina.pl/attachments/file/92849008935.pdf
    • http://ourconn.com/userfiles/file/202108030811178379.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/a71f5eo19gsa1nf69flbibb01q/98632578129.pdf
    • http://bogieclassof67.com/clients/71235/File/sapizarotedebeso.pdf
    • http://weingut-suppan.at/files/daras.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c599f4ac---17930704683.pdf
    • https://ubranni.com/uploader/files/gazix.pdf
    • 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_off0000c37f.bin
58be8e9c38a4e98940b67790e5b4635d733efee364234abf87b4c4ec5bfdb119
pdf-font-stream PDF embedded font (sfnt) at offset 0xC37F 15536 bytes
font_01_sfnt_off0000eb56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 16792 bytes
font_02_sfnt_off0001036d.bin
7d8455dea2b6de0f8faa39fae4f0673a3ba41132892a636e27a20c80af9b0d97
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 11004 bytes