Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1d1f3c3b07aeb5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 21:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32a87acca14a31d41a3f1ab05d66df92 SHA-1: c63a50c95958aaff84721d17b6279919e61ee05d SHA-256: 0d1d1f3c3b07aeb517af9b1e4d7c581f52a417ba6494e6f7163473125facb2ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=shallow+now+partitura+piano+pdf PDF link annotation
    • http://studiolorenzoni.eu/userfiles/files/48089095983.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c718c599adb---34490577341.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607984822eea1---zopatawerugonigesaz.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/pupurasodijojukota.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/jixopobopep.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zesozogikibixiravigo.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/89070a7e9f5851688fea1e7a9887ad60/79757042350.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/28078997542.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210819091825.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f9b65f9a2---67596639656.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/62463882615.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/kanavowuvitasirovaf.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xijugaw.pdfIn PDF document text
    • http://fygl.net/uploads/file/130031084355.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/novofexutolupupakawozimuv.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9a5c05b1---miledobobokurapezisa.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/bilasetisifupixawoxidu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b28d7dd450---lolugemava.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/malimobasufanifo.pdfIn PDF document text
    • http://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/47320403212.pdfIn PDF document text
    • http://suara.ru/img/file/goxilukifop.pdfIn PDF document text
    • https://bselink.com/userfiles/file/80349928809.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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 18248 bytes
SHA-256: 604a990fc80ca9ebcc902c6bffa7d7064ca6de52825f71674d507930114abc98
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 10556 bytes
SHA-256: a79a12579ac36fdbc2510f0965a1a90fcbfdafc8b8ead18cd16411c4c4177d08