Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c26a964aaf16d07…

MALICIOUS

PDF

97.3 KB Created: 2021-07-31 13:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00dc6d7641096ef154395e1c9cdcd108 SHA-1: 81a238eff61e80fdc92ab28369e2c3fa8d91be98 SHA-256: 3c26a964aaf16d0711428d4b9c2f69df14884a7a0f8e84842b2cb4b55eabca0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://drafthe.ru/uplcv?utm_term=assistir+ai+inteligencia+artificial+filme+completo+dublado+gratis PDF link annotation
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2df3cdb1975538a11620f7218790685b/sozuzopav.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/23f2e938bf979ca4171d0425be2e8fba/vamituwunelorize.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210621064555.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/lomorunivatiwufupeti.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/24013300298.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/renawabetilepetijog.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/29322217316.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2a5ksr5hgvjp4vcb2nselr6gt5/48403311788.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/11885767592.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607474d6e22c7---57328409211.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/44511740500.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/99f9df2064d705fa8190d3d8051e3a90/wemosoriwozebu.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/puwugawi.pdfIn PDF document text
    • http://epicridesnepal.com/files/xolafipuz.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t8btql7121tc599a9a0srhb1u0/mesidozivawofo.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/2da065273deed3377f7a59213904f3ef/38360592436.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021617155146.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3709a79963---74787816920.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/38759498721.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/801cbbd10bcb1094b7c8c02a014808b3/kuvekukosoxesekutatuburud.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/xatukewuxolomeb.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/31617855857.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3db1f4b1---46243787918.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_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 11184 bytes
SHA-256: 7023b21240f326bd0437d56e58b6cf398842ec103840704de1b106e0426ab161
font_01_sfnt_off00012e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14635 18764 bytes
SHA-256: edadc8cd59d1dc4346e23b3e8ad877b9041865b75bb7bf2a736f5e926fbe7e05

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