Malicious PDF — malware analysis report

Static analysis result for SHA-256 86613aa06842978d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-10 12:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 88ed733524f74ee5894b400145f1207c SHA-1: 5f85b3879912496ce7987e5a052796f320fa8972 SHA-256: 86613aa06842978d38d30e59270e00c90238adadafa3d1d52581a9d6748c2ad3
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://coretry.ru/uplcv?utm_term=speaking+up+without+freaking+out+pdf PDF link annotation
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/48579065897.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/tegusa.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210909_395EBAC983F3DE3E.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d76b8b7219411c624ffd4347fb46d947/jilonuru.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/witido.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/jekixawulekip.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79b5bcd1f---25461969659.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/20872765730.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/xoxomixus.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/zirufizesuzo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48fb3920e---belilaboxedebemar.pdfIn PDF document text
    • http://rentaruedas.com/files/others/nogejenexesasovimige.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/15892537402.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910083140.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/dujalogazavuve.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109090349199711.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/84540680660.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/xelubumede.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/lekifegulawo.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/24561263978.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/vewosumuv.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/27371871948.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/jilobusutijuxotu.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_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 19020 bytes
SHA-256: e8b039697e74742a419e49b6319f6068b6cf87f7c4da59d416f59a5980ce7edd
font_01_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 10916 bytes
SHA-256: 0fe51baa9c58cfd4f5d2413f406225a3bfeec0e26a682e25042ac473c411c101
font_02_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1