Malicious PDF — malware analysis report

Static analysis result for SHA-256 899183921589fa09…

MALICIOUS

PDF

93.3 KB Created: 2021-07-13 12:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2884e3887f01d8147162e11a37bf5b1a SHA-1: 027da65dd60b0372df560fdca0bdb5f7271ed2fc SHA-256: 899183921589fa09b4eb1cd784059488cfd0f930c24e1be7aaba06d13dfaa36e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload URLs points to a common distribution method for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c329178af01---lodigixafudirepad.pdf In PDF document text
    • http://geostudio.eu/userfiles/files/demabatepev.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/83812d38ac9f0d6e35e305d77c6ca465/pasopomakewusezumonulot.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/474b52446907a0edf56bac6627fbc903/47727508505.pdfIn PDF document text
    • http://ombs.ru/uploads/files/jetazitisutenimus.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5qg4nl1agom52a4kd8opdup95h/fefovejibatozevezavane.pdfIn PDF document text
    • http://gardatrans.com/content/Files/nijovenimubozetivoxiku.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b61927321a8eb6059ce3db8338701d47/juwekufodo.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8r3junuu8pu1qqu83vnj3v1si4/depiwebetowozafukerag.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb9838082---64776839347.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e90903b0b6---magog.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///zurijomujarax.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/77533271579.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/61560fc5ad8dabb2ae45fcf0a6ceb515/82611930415.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/90150b5ed1b0e4a141fdadbf9663fa2a/xalowigapeporexokapi.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/gegefuwebazegaputigo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae53c0a72---74834526790.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/086a6745fd579006b3ca1940e96587cd/fedifapukesa.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca983f0e4---vulegunixasozek.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/78905810934.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d4811755d---2400033816.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/62801805776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=good+answers+to+typical+interview+questionsPDF link annotation
    • 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_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 17700 bytes
SHA-256: 170162a3a66cb7e9f2b8c82ff3e7445158c883cd8feefc35c121883e4c4b0a97
font_02_sfnt_off00014e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0F 11060 bytes
SHA-256: fa1f15a3ed2eea4465d888694937bc91b642df249d5372a116cfd912d21f5f09

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