Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8670e77bc3c0297…

MALICIOUS

PDF

87.9 KB Created: 2021-08-26 14:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa57a3e6edad1c36aa1aa80e2e432ddb SHA-1: d4a6ec658dfe00596ca3058ee789793924398888 SHA-256: c8670e77bc3c02979cadc4f6c66a457a0ee2bab1614d76eb7f1af3f9161da309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users to phishing pages or download further malware. The PDF structure and embedded links suggest an attempt to exploit user trust through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=insert+pdf+into+email+with+hyperlinks PDF link annotation
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4648eab0f---39880125608.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a76cadb4920---14275062811.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/fizemo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1339ca359---gasibetobivovi.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/3990687341.pdfIn PDF document text
    • https://nistd.in/userfiles/file/kogedofafekozoloxadifak.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/7lr6dg7p1f6eog92o5ec691vmu/74002707975.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/bovuzexiri.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895d2501cb8---gobapurakiwawotazinos.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/jovalodule.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/rukudedatine.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/92029234324.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/rowesimepinuwesetu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16077cca4253aa---mifawexuvod.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bl03rl68q2r9stc5td7md83bvs/59081635632.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/52364733313.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/juxapuzab.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/68927812381.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3f256adc8---25765906992.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/83492967606.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/xoxuwopo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ab5a44bf06c67922f6bb9d8b3460b1d9/degegatobadozelekufafad.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/7b35832a2d1a53106e4360ee6258ec09/91967267769.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/zejakub.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9f60c5af---befaxuloko.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_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 17500 bytes
SHA-256: 699725fff304a1c45e7fadef2ba56ee67f9f45f810fda2a5f5433a7c82022409
font_01_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 11008 bytes
SHA-256: df6ac42a89af9a1540ef69284268249e65c17a341a728ff297480b9b803aecaf
font_02_sfnt_off000138ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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