Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0499cb32c09221…

MALICIOUS

PDF

88.6 KB Created: 2021-08-06 08:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 450427a5cae14a5e9eded639218af2c0 SHA-1: 73b2093f70d8a1cd7891986386d5681ed01bb318 SHA-256: 1f0499cb32c09221e80b8fe170f685e9e7a8a3749cb74a662ffca0879207a605
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, strongly indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection confirm its malicious nature. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to exploit vulnerabilities or trick users into downloading a second-stage payload, likely via JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://busankid.com/webfiles/board/file///69811142747.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beaa9eeee65---85788598348.pdfIn PDF document text
    • http://landpas.pl/upload/file/givejevulififeri.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e912615b5e1---baxizef.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/nidana.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/79895548201.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/71835609977.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/dozikorawixetidawabo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a16799bb8ef---pasotoxegapifa.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1623840239345094966.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5b079d782---38457986714.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c92791e61---59967781037.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160775df82a019---8882673757.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/fawutotenijen.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/xerazejefevinemimaxawevav.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6igbcm39t50j3eaq1apijmb0cb/1381491704.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/14473bb6edcc3567ae755bdd4933f254/penowaxetiwekarekamegemut.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4uj3cvatp4hnrt3sps4a4a13q1/pezolubabaf.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/fojarifiluvaf.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/13577006499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tamil+hd+movie+download+2019+tamilrockersPDF 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_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 11304 bytes
SHA-256: 0f8d09f980cbc5e01a952b48f023e6273ca3ca8f8a2e8be162773e817170edbe
font_01_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F3 17408 bytes
SHA-256: fbac15f2ab24246a919777f7e1a28892b9d483a927fff9d45a20f5048b937aae

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