Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d888ec9122ae4c…

MALICIOUS

PDF

74.8 KB Created: 2021-08-22 04:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4a487d27bc6c6a67bb3d8daf572149cb SHA-1: 8987f36902b4e251bd77a4fa494c01b3f20a7d4b SHA-256: 26d888ec9122ae4cd47465fcdb5590c4f3dd76ab3184629fb3c8be974aca48fc
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 domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=ap+world+history+modern+unit+1+test+quizlet PDF link annotation
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/jezetuxetosolo.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/78721159673.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942bccd3442---jefabeg.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/jolozenu.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/tesuxofipanarumategijedar.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160764bb51b6ab---73191505632.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/jabasiwiju.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/noxoxuvilusitemugoket.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/xewodubur.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76662840912.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/9f1d467277b807037c8aa469c58b5f4f/57197459872.pdfIn PDF document text
    • http://naucseto.cz/storage/68327239906.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/n062vf569i3v2ajslqdvl5i4h7/59012363105.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/97731722809.pdfIn PDF document text
    • http://generoussecurity.com/uploads/19731430737.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607682ab6c28b---74065692647.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909b0dbf325---sipolalopenorejevubawubos.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/zibojawumado.pdfIn PDF document text
    • http://congluc.com/upload/files/dekodutumelaroxomet.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/8355401132.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/mapakitadinawax.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c11fd05846---temiz.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/rolijipevite.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/217a575f82212e91b091076a97c1f391/9458677629.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_off0000c51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 15280 bytes
SHA-256: 5e22d1ac256ccb75138988a2b3c93f926b34e35bfa3d067e49d8752128033d0a
font_01_sfnt_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 11032 bytes
SHA-256: 9d2b0b4d05d60afbee719e20b6432f79574651f9230b2d7ce0c63a7ca27c724a
font_02_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1