Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc80554d9739c59…

MALICIOUS

PDF

81.1 KB Created: 2021-08-21 16:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e919c55bc2e6aefc1980afae14ace28b SHA-1: 835bbfe9eb84ef033ab626c549f90467e10aeace SHA-256: ccc80554d9739c59effdee52a1b68043cb3263d0d8f3be35f439812a25fdc4fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=best+video+editing+software+for+windows+xp+32+bit+free+download PDF link annotation
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b66003a2a96---12053906437.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/wuzotafu.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/fotodiwuzulukebakewi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9520cf087---pajanujemurusirepomubu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d925c916969---36036584830.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988ddd43453---41896532112.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e3746b7bdc5ac7a602f8ecd4aaabf333/99191530926.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a42006d5ed3---67313639033.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611130b37c3ca---wujenak.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xotirujajumet.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/72152159420.pdfIn PDF document text
    • https://tpk-m.ru/files/file/takezelari.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ff967723---59937490666.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qmaju5hibi27tsi3hiep21fnq7/10704311271.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/23715294483.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2849dd90fe2ff865dc2ec725ad5467db/gavonetutiruf.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/20cbb66af674614639aa087ef29cefad/bosuvivuv.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/45910345301.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/98105581577.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/fifupademo.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/6677950306.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ag6uv9bdlgpri3ocjleilv1l6n/77046648386.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160964bf367f8c---buromitewunilajoraruw.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097a13798675---neduduwomosivirimexa.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_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 11412 bytes
SHA-256: 41e45d93e2a00ec7a2d053206460df04fae02a98556350f1b2dc4d146469b668
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 16328 bytes
SHA-256: db0b2f4bf109e53f68203c24d7aec14d51c88f3317b238076266f5afa0597f54
font_02_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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