Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad71d2190223f2ea…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 20:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f91dc457564cec6cf4fc869cab20b542 SHA-1: e9c1cdd0add8a72ff8d437b4ec2e0ead372f836a SHA-256: ad71d2190223f2eab6c3298bcb45ac2006abf4da23bb6b2fc5ce4e43c8d36d38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=internship+report+on+cooperative+bank+pdf PDF link annotation
    • http://blossomtour.net/FileData/ckfinder/files/20210726_08923611D19D0331.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/72080002976.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/ranexi.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/237a775b0b3c7e810bd21fbd59fd3395/72602372402.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bb5041af5---pogaf.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/58432557353.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/82351394872.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/915cd8791b5a04a910165c1b2ea2a3d3/92082630169.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/unnut1sll13c5d4dim7naohamv/49416287521.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/matevaxudosimotedag.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/54593112865.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/xaxopapuk.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a99c7149---18374538326.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46c840f26---dudanuzose.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/13787121148.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/83016460586.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/fd8554a66db714eeec55086874bcb6fd/muxakokamozunifevibareviz.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/gubulumokutetelo.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/kogobulilek.pdfIn PDF document text
    • http://sakem.org/userfiles/files/legonuzepakononopoxiwiroz.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b9154d53e7d1fec5b953264afa2cfb80/zasagalimik.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0055c5b91---46985840061.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/moxedanijebewepugemaruteb.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/notawufixizokasofaxud.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_off0000cfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 17468 bytes
SHA-256: e4c8e2a6d4cf1057c0cde33b0206ae47f3eabaf10b327498a172a318a0c22d30
font_01_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 10920 bytes
SHA-256: fcd280c9ba433d785df86f53d7465baf48c530b06c92942321521ea60d570951

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