Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f82628456d8735f…

MALICIOUS

PDF

95.7 KB Created: 2021-06-28 05:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c2e0c2e55e71bcd2892941a69638cb9 SHA-1: 8eb84f608ab27c1c23dc10a2e158e7ca1c22fc08 SHA-256: 1f82628456d8735f08e77b4ba45e6a3ccc11d08eb9ea2744ce2b544e0d956d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and other disposable domains, suggesting a campaign to distribute further malicious content. The presence of embedded URLs and the nature of the link farm strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=4+pics+1+word+347+answer PDF link annotation
    • https://preprodpcb.com/userfiles/files/xidumuvazorujolamadur.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/wigenufuferawal.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/24495c66298d6be9aecbf962409dda71/nelipisaxesexivik.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/xolexod.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b388e8ad0fa---55957128051.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5f0ef853---rirulegokuparoriki.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8925aef1---42470557097.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3549f3ba---40032647105.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/86231640578.pdfIn PDF document text
    • https://palet-school.com/files/files/wilanosesadefagupusa.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/87866027960.pdfIn PDF document text
    • http://capital96.com/userfiles/file/javazur.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2d8c04633---69404424200.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/waxujilipavexevejimamara.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/jg6ar9gh3agtrnkm0mb9modjh7/demutel.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/30671453681.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ff3450f9---laxonuseripulewifu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b09d2d88d6659506cf7878facb7b785/liget.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/93082295824.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c4f69484---gasobulubimifarumugexanob.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/75866b8e13e320aab42fb89aa2f6bb61/78533713186.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a41431e37f4---fotugusut.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16075db266a3c6---dibutiduwaneximes.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 16084 bytes
SHA-256: dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889
font_02_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 17984 bytes
SHA-256: f73f392b2bde1fe3ebd6a108805b1fbda436ab66d8eb6bc0f4733d75aa2318d1
font_03_sfnt_off00015c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C31 10704 bytes
SHA-256: 8eda02f76d26561594246abdf0aa0b4dac2b19c801b883f0373699380323f2a7

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