Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80afadccbaeefc3…

MALICIOUS

PDF

80.8 KB Created: 2021-08-16 01:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44328e1516c5fd81bab398410e6bd669 SHA-1: 0f2b261822d7de6af05a070e1b7b9a6660d4adfc SHA-256: f80afadccbaeefc36805131f843b93034e00bec21c980c945665ba5ac1adc219
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://worldnaturalfood.com/image/upload/File/12947026885.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089c3677dbb1---luburikezedefito.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/75088903492.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745e8de6366---69256882268.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/29544370058.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/64715559229.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/30ee3370c5363d09a0b9d6ea3f6031f6/sijutifelo.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/75207892914.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/gaderip.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/53900599358.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5dfb2hom3mrmhjue15gtee219/lefetitomuvududom.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fn21ar0pikg0l7k4qvh9pq0emr/3932815785.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/bazomaju.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8020ac1419---59561567901.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fc43938dc---31320424299.pdfIn PDF document text
    • http://compsult.net/userfiles/file/52592857816.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210620_EEA2F1DBAF9866E2.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/73537705425.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcae9ce2186---27971593322.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49276e43e4---dobawenirogor.pdfIn PDF document text
    • http://adice-area.com/pictures/files/87109379743.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/nitetud.pdfIn PDF document text
    • http://wixoon.hu/upload/file/pirojuxumasobar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=icivics+worksheet+p.1+answers+government+spendingPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7496f55361e28f3e77060c171af24c35/66646600155.pdfIn PDF document text
    • 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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 16236 bytes
SHA-256: c5b1453a628bd0e9049804414e0afbdfc53b62b7f1cb1ed5b9a72ba15005be7e
font_01_sfnt_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 11228 bytes
SHA-256: d3b9a6ba0b55f01bd118f22081e6caa29ef436e718d42d5d0d930aa29d55b439
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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