Malicious PDF — malware analysis report

Static analysis result for SHA-256 591be1a54b59d283…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 05:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff42bf30a97d96b10702f043197df6aa SHA-1: 59697e1517f56e42ef48145359eb7edbd0ea019b SHA-256: 591be1a54b59d283804924b9a690d9df92422dc28c3c1604d6b36f43dfe7d8da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://garglob.ru/uplcv?utm_term=breakers+novel+pdf PDF link annotation
    • http://ansonseatery.com/uploads/files/fuvakidetiforulakelaruned.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/nupelesirizitiwefugubo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19dfebe2d2---vuvawodululavoxanajaralu.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/zewitotilipune.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/pififomawujatuwifut.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/toteletirekagusu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a43480b01da2486e6f0b6c9e59a1b1ae/60515634181.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/21169153654.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/xaladopudizefafogelekozom.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/nuxujikafes.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ee68a60feb4d43eabc416692b14f163a/50825193948.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/88639435905.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/vorubukefawetutumuton.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/55d36fce3f6cff9c02a4d0630e36d155/mipekojibigit.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/47983411453.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8049d20e3b671882e969e9030d7fc671/raketisobuzowavisipof.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623624311.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d5be88550107d66d249cc1c1b8e0fbcc/65842912211.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6b368e95---ruforonumipe.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/cb05def8ff9172ddd2a54f6f92e621c6/fuzotegoputobij.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161175eb863681---47014431703.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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 18112 bytes
SHA-256: 75a7e9d2d3e15803606230ce000d31db843ed28c9ed8199ce238f431435dfdc5
font_01_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 10512 bytes
SHA-256: 05ed76ec891c038f5f0b83a4aec517cf8d2f24fdb5de265bad0e19e47688d3cb
font_02_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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