Malicious PDF — malware analysis report

Static analysis result for SHA-256 025e5a273ebc3838…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 14:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b2b4801aaba62df94dddedc7d4d203c SHA-1: 0641b497e1baa99adeae75b89c95f76d3b5fcfbb SHA-256: 025e5a273ebc3838aab2db44351fc70cc90d5a915a10f8abb5f4775a02e8d456
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://crysiq.ru/uplcv?utm_term=usb+format+software+free PDF link annotation
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7aa56cac6d---kesogugoneguzuxev.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b7f3ad3a3464d360e242358cfbe4e1f/65732495223.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e95292f1---tanelipesek.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/nudaraxaraninetedupaf.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/lizavasez.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/mafekubudajabo.pdfIn PDF document text
    • http://agro-partner.com/Image/files/57411235235.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/wedobozisopebu.pdfIn PDF document text
    • http://armanetti.com/images/50801489592.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d4f279f0962bcd0b3d4b63f20d001f4a/remebipojivefosafek.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/c7539af2ebd44989b3da8702443a6f96/setolorenuzijel.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/nujelibijapesusigebi.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/nuzol.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/q2b8lnt0j189p6mfq2i2gch5b3/seduxiguwijivumuxifid.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210811134625784936706.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090c7703f049---53158459849.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160df48d570289---xivufarazozurebudemeb.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/61112826059.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///1242830822.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/8eeaa4d5093f0454f6e9ddea14cc50f6/7861702548.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03d2152a2d---tepemunilapov.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/67061299420.pdfIn PDF document text
    • http://zuche0551.com/upload/file/jinamesalaxotepimuvime.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0qd2cgh0fmtmsbk70mak4g8c26/sezopazaduwenu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2eda44099---51491370041.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d96022d90e0---19714577918.pdfIn PDF document text
    • http://camonetinternational.com/files/file/83135679703.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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 17456 bytes
SHA-256: bd2a389d9642540de6d637aaa4f51a4bce04052b745cdce0edb10afc3dff0da1
font_02_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 10364 bytes
SHA-256: 8c968ddc22ce62bfe03e198bdd93da92622f1d46e2f64e8b5892cafdf5939a2e

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