Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6b833dc5ae5de2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 06:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c30bb8d9dd382d47a47b2e6fae199657 SHA-1: ccaa0d6a0305d55cfaef5d66b4bb3818d83fae48 SHA-256: bf6b833dc5ae5de2f2d4669a9ec946ef06db1de97c19f5f1a7c4291c70e36425
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it is a link farm pointing to compromised upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://premium-house.uz/images/file/wesemetedemukax.pdf In PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/71940859245.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/6959689915.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/47834596935.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/takagijugidurejid.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/renupiz.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///86182889961.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab152a5bb0---bavusebugitijula.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/52533076378.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f5557b5b1c2917d0f1177a1f8a9d764/sixamatovuvegidanu.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/99265309983.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/42688496074.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/anvkn67a6ddm3ta2egiplgc547/zusitipekuzovugagub.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/pivebodipolefosuri.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/7682376665.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/40877468931.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a2f46b877ff1a092b50abfdbe00d9c54/92042688107.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/bavezokefejowixuwoxoses.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12fe049d6---kigadabiw.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/dafodomamufujomu.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/89855327675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+update+samsung+galaxy+s+duos+2PDF 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_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 14900 bytes
SHA-256: 5358faf3596f527ba7b0dae72541c63e5f78252b0efbdf05be7f7bac34f71569
font_02_sfnt_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 17676 bytes
SHA-256: 34078985f801e472dfd7c3da8105a1181bf8e81da8e7cfaddb86e7024cc2313d

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