Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f780bd4e62e7716…

MALICIOUS

PDF

92.4 KB Created: 2021-10-11 00:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da4b405439f5b6e89fb9e439ff4ef500 SHA-1: b1a94562ef8b2254e2c6961da9d15cb01e34d3a1 SHA-256: 1f780bd4e62e77165935d57a7b39c9a2e10a605325b53ca9fae72b65914522c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5872c52d3f0d3b839f7037489c3e2598/52171145437.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/o452ohadd1eriitcjr384ei9sd/348812970.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/bogiwironoferoretuz.pdf
    • https://gentrilieu.vn/userfiles/file/17319198500.pdf
    • http://izeninfo.net/admin/upload/files/95815445578.pdf
    • http://dkmmotor.com/files/userfiles/file/4253091780.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5a81d6ec807af1a7fcf9cc0194e3d38d/lorajezofapujajexoza.pdf
    • https://mumegram.com/userfiles/file/somubanopawi.pdf
    • http://chalappuram.com/userfiles/file/gejefunijevafatul.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/bofivawoxurukolegegatase.pdf
    • https://galedo.cz/www/data/cms_files/files/sedobusutuzanupevuxapo.pdf
    • http://yuemeism.com/uploadfiles/files/jilumepesa.pdf
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/gipisarijaliluj.pdf
    • http://nutronicltd.com/userfiles/file/67434515410.pdf
    • http://tysons-cafe.com/uploads/files/5299204535.pdf
    • http://fst-uinsu.net/userfiles/files/15805175007.pdf
    • http://obkladlazby.cz/userfiles/file/melovuwixonilidoto.pdf
    • http://ogledalata.bg/uploads/pages/files/62117516850.pdf
    • http://engroupe.ca/aym_image/files/goper.pdf
    • http://hk-sai.com/ckfinder/userfiles/files/32002879563.pdf
    • https://ceccarmaramures.ro/userfiles/file/mejodewonobigalerunol.pdf
    • http://wawa757.com/uploads/files/ridafexadipi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=about+chloroplast+in+plant+cell
    • 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_off0000ff87.bin
d617d191832c13ebc32778eaa2460ddd1cdac0744c605dacbc159b3bccbbdcae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 10692 bytes
font_01_sfnt_off000117cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 16792 bytes
font_02_sfnt_off00012fdd.bin
fe78d3bd5e08d4429a3080688b4cc729a9aa8d98ad94beb5d2091557207bddff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 19936 bytes

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