Malicious PDF — malware analysis report

Static analysis result for SHA-256 443efd37c143c9a3…

MALICIOUS

PDF

86.7 KB Created: 2021-08-01 12:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23cfad9625116f746d49bf651ad53e76 SHA-1: 88e1b344ee6c0b2359a634d7539bfed2c0c71fa1 SHA-256: 443efd37c143c9a394c51a31cb438bfe85c6de3259a30af9b747f6db0e8b37c2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c790e71c5b7---28163616195.pdf In PDF document text
    • http://hnkingdee.cn/Files/file/2021523153338.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad975d210e5---85808177302.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3f698a99---82104898642.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/poboregokelizedosurigiga.pdfIn PDF document text
    • https://botroul.be/uploads/vavuzidovasojiripet.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/24285551274.pdfIn PDF document text
    • http://geose.ru/userfiles/file/nakoluginakosapakuzorani.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8be9dbc10f---33661273249.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/pixinutogitulipopopewu.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/2149002842.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e46fe25c6---13982788106.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/kesotumodukevuxasabarit.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/hp46rk2ffdktjbqvqffb0arqe7/ruwoze.pdfIn PDF document text
    • http://darec.sk/files/files/97249359865.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/63176746867.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/nofebewibenezunodemi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/j9dkf3bn9s5ucjc6af2d617pt8/58735203985.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160715843d7e7d---42631005489.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/64428185476.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/iivarldnnui79si6upakmfjb41/tetofixilejumexavud.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1167829b2---kikis.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5a5d852bbdaf77686aeac5ff4232cc5d/vepekevorunamab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=%D0%B3%D0%B4%D0%B7+%D0%BF%D0%BE+%D1%82%D0%B0%D1%82%D0%B0%D1%80%D1%81%D0%BA%D0%BE%D0%BC%D1%83+%D1%8F%D0%B7%D1%8B%D0%BA%D1%83+8+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D1%85%D0%B0%D1%80%D0%B8%D1%81%D0%BE%D0%B2PDF 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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 23476 bytes
SHA-256: 6ac62fc5acbbdd1494cfb8387d5f46936c443fbafad18a95d251e30da2f4c4d6
font_01_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 11180 bytes
SHA-256: 7189f94a6ea1d3795bd02c00ffdd7a997becb70dc30a5108c4d25f5665dddfa0

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