Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af8212fb64dc7de…

MALICIOUS

PDF

84.1 KB Created: 2021-08-23 13:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7d387e5dc80e724019a710a0b0949df5 SHA-1: cd631e5939003f3480ff02bd747f5aacafc66777 SHA-256: 6af8212fb64dc7deb14007f87c324743c3906aef595fbe60adaff4aa10e2b96b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://airflow-skateboards.com/upload/file/65647633021.pdf In PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/76828178921.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/87097714872.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mesgmar70s763ep3ioeship8t2/ruralewojanafewina.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/migizigajegat.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6cda89744---45174452113.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c071122935---73398902963.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9cf730ec---goxapoxalarozevig.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/nuvijel.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/21385390018.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/71641864673.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/wolazisa.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/inqv8lac9a94cbn486vkhpace0/mawajanomi.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/pogamerivaxutej.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///36543061031.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/lavekenoluvebug.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/fajiropivukitaregixazo.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/54660738679.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/jinonuliva.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdcea655b---banopivajejamulozaku.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8603b737b---16838600267.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4t3qqenidbg4pvhtchq0msrpm1/60944053836.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099a759a909f---18884535022.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fe1d823b0e3623dcb9c5b7236226370b/bubimolodi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7522348b9efa6c18bfa0d51d0ddd20a3/24313950718.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/jq62crq0pnp136rj40ffo09tnu/mikozidoxipexudojinag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=snookers+bar+and+grillPDF 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_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 10632 bytes
SHA-256: 21d6807ed31f3d85cab0ab44431bc1ac18fa8b61ab90d2680196c47ec72e84e3
font_01_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 16796 bytes
SHA-256: 09816040adb0301efdf3e7e6889adf92d12904739b99670c57f3feda46692121