Malicious PDF — malware analysis report

Static analysis result for SHA-256 773ac9cc7561176d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 19:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 778688a18c2ef4496adfbbcc70636ad8 SHA-1: 53206a4ccf803b5680bd63523511e9d904dfb5ec SHA-256: 773ac9cc7561176d756fe844c3ddbfef76de0a6577bb649835bc80e0a0a57386
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kidsjeodo.com/images/files/naperuvi.pdf In PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/nofizetis.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/56e19a5d919bb9ae8f4357dca083b47c/76183441327.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/92449269659.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/butinobowoxaveretupedisa.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91953412f---gozalojena.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/wodapukuwunezosonowoxam.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5c85d6ae---86543887775.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/nefupux.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210718_E80532CB17A32AA4.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/jafekarivejowejogoxas.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/49ada87f0cd4840ebc95b1fbb66d3026/pajowotib.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/gakoveragujideberedopes.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/56265364777.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/76237492824.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2r5l1jn0mffe4febub3j9eq830/dipiranamuw.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/19387650540.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/89790466193.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/42915242115.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/53420840467.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/tokabelexulipepoperizalel.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/tewatizugiposoj.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/298b19f4ecf447ae4a2fffcade20e66f/92292030549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=reacciones+de+antigeno+anticuerpo+pdfPDF 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_off0000b444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB444 17124 bytes
SHA-256: 10313a8aa0e83b356acf9c5157011944099e4948ff36d2426b61b845bcae7a9b
font_01_sfnt_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 10892 bytes
SHA-256: 98d3180dffea93864be09d51d10c1ea73143d6690c2599f141b0036073c06aa2
font_02_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1