Malicious PDF — malware analysis report

Static analysis result for SHA-256 738a32058b05d4c1…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 17:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 678ede3a945a95a3cd49139a24ce2b8e SHA-1: 1ba24842516add0f97a89a8d1b9d73a15575419a SHA-256: 738a32058b05d4c156f1b3a0c327fd5c3e67c126a940fe2dd98f072f1699335b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The URLs extracted, such as 'https://philabc.ru/uplcv?utm_term=secret+seven+book+pdf+download', indicate a lure to download content, likely to trick users into visiting further malicious sites or downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://philabc.ru/uplcv?utm_term=secret+seven+book+pdf+download PDF link annotation
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qfblo92s1oh4qsdiuddr4skbbp/92687556849.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/31404705033.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fc68626a1---zukeberikazugex.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608da30d3bdbe---95417077051.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/gatifirazigiwowipof.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/32170350489.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/61229793997.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074122940f57---62655199842.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5f0e479e5---91157039809.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/18205493502.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/ruretajezigajuku.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/61894090132.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/99861763460.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4cdd89943f206a7e164e2d0dd225ff0b/62862119748.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/muxised.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/kipisuf.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf054caa8---1191967833.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/bogukotef.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b380350bcbac30a26be4010f10e63b82/bazujejexibuz.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae936b78f9c---domoluzo.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/8ba18875e453bb8229e32f607fe09e6f/24168193655.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/75515656541.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d7817c2b5e2---jurux.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/jetipodurexizuxeluvafek.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 10980 bytes
SHA-256: 0d5afa80bf52dc9f2a3e80fc1bc21ee9633288cdf73b98da2a16a5571e411e29
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 19080 bytes
SHA-256: a1185356e43ba845bdcf8c3785b63e2979ae084fcd7791bb575334e60c75e551
font_03_sfnt_off00014ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC0 17472 bytes
SHA-256: cc63eba5949d2b84bc20a5b8686512d91a390356e4b4ec8e675220a42817b1c7

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