Malicious PDF — malware analysis report

Static analysis result for SHA-256 f926946076290a19…

MALICIOUS

PDF

86.0 KB Created: 2021-07-21 03:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38a171c2e4e1d613b0e94aea89420b5e SHA-1: 6f6a9702ef3243187da76b2ad9d5c9c526a52353 SHA-256: f926946076290a19fb35a7d29fe534ac094c29d452c3b91d4c0f55519b4d11d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. The PDF contains numerous links pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially compromised, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afffcee48fe---nufej.pdf In PDF document text
    • http://studioguidobarbieri.it/userfiles/files/37650126624.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/614df15255150351b7d17e909a960106/83839437168.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/zozigaku.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/8fc2987fe324934eac8e4c8e1b7a5885/33499915361.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/91038943745.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/sezudugafilemipebeved.pdfIn PDF document text
    • http://ashioke.com/images/library/File/maratulaxovekale.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc945fd72---vafinuzegukip.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d88f4f0a0---35143331794.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/zigomezomiwunuza.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/33657996546.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8f3c4fd177dd6cf225c3cbf7766e4ad6/zogetagivoje.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7b5c3035193637830e67d7715026b02d/67761578874.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/lemiburalasore.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/51727156864.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/befafikexujoremurowaruwog.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/bajug.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/ganeluxibulefasijixivob.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/4faf1f6fdf9066953d37e4d7475c6a02/moperagafunexilejedarikiz.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708da863cab---63251621048.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/nubalubotowomez.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6254a003a7fa55038c1e92ae9c5644c8/molubojowowixejoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gregor+johann+mendel+experiments+on+pea+plantPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 16888 bytes
SHA-256: 476efb36c8f048e3894a40fc34aca4fc5f513627a3d46aadfe604986bc5eb2a5
font_01_sfnt_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13107 11108 bytes
SHA-256: f5381fec4b3ede074fe994fba524b6182acad9d2df1c2d06afef0f04e2457607

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