Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f3dc90720eac4d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 08:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d1945483d7d9dbf5c7c6459dae0dec2d SHA-1: 59ac24b162a31299eb348378d6c24386f0afd95a SHA-256: 06f3dc90720eac4dbf82d444697b6afdb6ad5171c2f80b8656c81526120aae71
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=microbiologia+veterin%C3%A1ria+essencial+pdf PDF link annotation
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2c2eb29a543af0f5e5ccffd9898df752/vofopurizopekikefelokemeb.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0b8c8a31310b9e0d55a218ce5322dab4/fuxirilifuxolanedot.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/dvht06jtlsl7iobqu3k5d6lf4s/33299706831.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf63d59eb9---36847327599.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/12861778313.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/pewafivogakawi.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/defaf5b882479af3c84abc2184355fb8/95352268934.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/vofamizaw.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/53958907130.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/21e2acffe9e532b579c12072c71ac4d4/45069398178.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/vanunamuvodaxar.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/79505628814.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/58322591415.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/gopokilijikovijifixuj.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ffcb166f---sifewusoposimekizozanu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e182586451---53701702933.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/37534081963.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607376aa56d13---70228944651.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c09402d15fe---86203754600.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/falarilolawavas.pdfIn PDF document text
    • http://jucal.es/images/file/werosifoxonanokulivimu.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/pivuzazifufurisewab.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_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 20984 bytes
SHA-256: ef036e378b51dcd1f19bdad8d65ca9612b2948d05ef18e12d16d2f58d89c55a1
font_01_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 11176 bytes
SHA-256: df538f07d17f7eef9fd1a3f4638bb96a85fb628d6ae2316779ed671fa0db72a6
font_02_sfnt_off00012bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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