Malicious PDF — malware analysis report

Static analysis result for SHA-256 41635b5508eeedb8…

MALICIOUS

PDF

114.4 KB Created: 2021-09-02 05:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2bdde47a086bdba883e453406fcef177 SHA-1: 809b0a7c08ed68e00ae8529457c0f9d788e16c72 SHA-256: 41635b5508eeedb8d8bead257a840fd594ebcdea641f3c78a3c36723e31586ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pixomot.ru/uplcv?utm_term=indiana+jones+choose+wisely PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/17345135303.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/46330592672.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5c72ce9cf5d6d20c943a80da8d2cd6d1/makeda.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b33e845bb---jotuvubopusudirunipul.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/xotituwozitibuzadubozo.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tufuluvo.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/kidojiji.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/bokopajunoje.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cb1028d97b9d59d1b95a36e93f884fbb/riwiz.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1c136ba290e4fb2e7e326ab2650de311/34383502244.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/gefalegofusuladusavax.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bc1ab2407f9177a38317f9c0df8f56fd/70755984572.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/pujaruwud.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824bf699c77---gujus.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/26170131479.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c26dc4d9e---barevowavozevoz.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/dijowu.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/xexakofegimipodezatatido.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/cc9c521950349fb2b0ad7d64516057c6/7813580911.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b9488d956e---12438909909.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/felixipimasefomomazuxuxom.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/91436670357.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed4fa49824---rerageviwelewibe.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_off00015a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A06 10552 bytes
SHA-256: 201775ac419d4c7ecd0d383b8ce7a871d8c6b78a34c31927f382fed178c6f2eb
font_01_sfnt_off000171fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171FD 19116 bytes
SHA-256: e4dc368d8c9e651b61bba20f2d60b00be1aecaa1258635c3a91616873fbbf803
font_02_sfnt_off0001a383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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