Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67197df76759cbc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 17:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 588dd2d54366639bd5624e3e743ae8c3 SHA-1: 594c9b36d956ab7fab0d2426cd717bf06725ba5b SHA-256: f67197df76759cbcae6c5e86f751bcc9454006fe3c25009176bc0683c17d4a2b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The heuristic firings indicate malformed streams and link farms, pointing towards malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://drafthe.ru/uplcv?utm_term=can+you+recover+deleted+voicemails+on+android PDF link annotation
    • https://hotararicedo.ro/files/files/75564677112.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/dubilibugiturif.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613052999f222---13686678137.pdfIn PDF document text
    • https://atavio.ru/files/file/bovinepaxezeputaxu.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/59185702427.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/tarodutipegaj.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/38234557541.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/85811761779.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/84274504914.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/ramovemup.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/19400272431.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/20424812647.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/61898878464.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613726e426836---45670555604.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161375b55aece3---61322754048.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/87963618669.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/9250397201.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/32932018810.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pudisijote.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/bujuboxudap.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/poguxuzanuvosuzagak.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/75424311249.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16137808f31c2f---36014279744.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/bebogogomogilajuleninosi.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/petefase.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/58261973806.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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10844 bytes
SHA-256: 68673278145d7cda8350e1270a8b5a028be22cf514f1560e17e9a2b0df395f27
font_02_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 18040 bytes
SHA-256: abf0af4f9ce6c5ce11e308f12806a146f7aeff68013701e9b4e1483f933aa1e0

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