Malicious PDF — malware analysis report

Static analysis result for SHA-256 33510f9fb89b7cda…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 01:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73cf1808cb48988e1b22fe86c11c8427 SHA-1: e4651ee4d972515503f9f6933a056d93d7889e26 SHA-256: 33510f9fb89b7cdaa05c4c7fe067f09cf8c50abddfa37cdf6fb108a277e98fcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs, many of which point to compromised CMS upload storage, 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 0.9973

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://crysiq.ru/uplcv?utm_term=cambridge+dictionary+app+for+android+free+download
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140dc9909d74---domakedidamakitediridor.pdf
    • http://strap.sk/uploads/files/21389164456.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/22f8d6aba402b973bbad1262ae815ab1/siwaw.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c6186vret8jeojp47cs0qa3gh0/selemidisutedarafalilew.pdf
    • https://eternalbliss.net/file/niragogabuda.pdf
    • http://studioesflores.pl/obrazy/file/50481197040.pdf
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/sagutagipolum.pdf
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/17947800809.pdf
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/77143570585.pdf
    • http://ktcyy.com/ckfinder/userfiles/files/54562008716.pdf
    • http://bertrandetgastineaudesigners.fr/userfiles/file/buguxop.pdf
    • https://tekstilkentrehber.com/upload/ckfinder/files/kasifusub.pdf
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/97535483096.pdf
    • http://rasmesafar.net/basefile/basefiles/86918428337.pdf
    • http://xpeedon.net/userfiles/file/20210917074953.pdf
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/69787794600.pdf
    • https://pracowniatechart.pl/fckpliki/file/1822583927.pdf
    • http://eros-arena.com/eros/userfiles/file/xubowomufovugofivi.pdf
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/25747425825.pdf
    • http://sangsangins.com/upload/upload/file/44839905190.pdf
    • http://www.fonfe.com/uploads/files/42687332934.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_off0000b354.bin
2876b0daf2dea9b9d34870333a97e1eeb754b0b9a2d9be21680f5c0484050697		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 11168 bytes
font_01_sfnt_off0000cd0d.bin
6dbc00e5e86924c8222063db428cfc50ec77d07a71de4049d77e0b60d634675d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 16616 bytes
font_02_sfnt_off0000f742.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 16792 bytes

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