Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca453bc97488739…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 23:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 567be5bf6e16c2ecc0399ce8de837eb7 SHA-1: 99bad550eabbde83818da48af89d4395b42cd073 SHA-256: 2ca453bc97488739c8995d637b8ea41517e6150005688e879ae6ec0d5aba8d7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=journal+entries+for+deferred+tax+assets+and+liabilities PDF link annotation
    • https://landatur.com/files/galeria/files/43243390405.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1cb7666cce95c798d4044ea1a5749f30/nemodowoxenonavabejonagu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160823f2748699---palisesotubiwugexes.pdfIn PDF document text
    • https://jurad.eu/files/file/ronarabexawaxeripeti.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/52418668001.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/8329108127.pdfIn PDF document text
    • https://ferropula.hr/files/fitasegelibaxerofiginopow.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/25234144431.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160777f5eef38e---34143796513.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/68882a69d4a742f25ca515ad84c3b2af/gigofurimajuw.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/jonebirubitagulasowa.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3003a6e916---ganiwobobiguzubozifo.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/838dcbcc5281584631728467c278d28e/40481587696.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/48578883608.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/91ukb23fmcsv4jslb3nkpu2lvn/jaxeratimitasenufetezab.pdfIn PDF document text
    • http://heizler.hu/files/file/13011399318.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3a4ac4dd---supasonuf.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/30156463145.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d503e504ed5---migagewinemavorin.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb50d6199c---pewutefemopuronaguwejer.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4ab230b6b05bbd9cb8466f8d1054d1ef/13221888452.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/72866540537.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/zugalenagamatuwumuzi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/busolojeviboz.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
stream_007_off0001334f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1334F 18500 bytes
SHA-256: e19fb6237a497942a7420c2d363f1764f0027e5bc17d863dca808a49db457728
font_00_sfnt_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 10680 bytes
SHA-256: bdbb3dada8b89dcd869bb511f0a63cd1b144435a1c19b8fe5fcfac18f6d99e7a
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 17004 bytes
SHA-256: f98cdb555494b6e08570f1bb630d2414951a10ec32b0f383b3f7d6565bc7d2c3

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