Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a7461f07274e4a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-06 14:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82b9f8930767531bb3cdfb9c91b9f79f SHA-1: 782e1448dfd84e4cf771202035b3845eb85e6d09 SHA-256: 07a7461f07274e4a38d0a24cb28ef1021793d308ca56fa58b2454d9e4854c13c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=can+the+welfare+state+survive+pdf PDF link annotation
    • http://tms-operation.com/upload/files/18838990448.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/sowazisadigixoxezufudof.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16128ff1c9a1d4---rebarazip.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/20298485524.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/kirimavuzumabazunozometul.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1bi02sv0r7j6ct6ggbjsc14ct1/modirusulasem.pdfIn PDF document text
    • http://cochu.net/resimler/files/44065148358.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610324d9e2f4a---43808145753.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/73780990146.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/31732755230.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b77da2d7dc9---bitesijo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3e507782949121a8262e504937e1eb06/1056511202.pdfIn PDF document text
    • http://emeat.ru/var/files/daxuronopanubegixamugesu.pdfIn PDF document text
    • http://vipdiler.ru/files/file/puvufidoxa.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/51159323396.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/85938714473.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/38534072702.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sajedijeba.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/puzopawurenezozopezovaz.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/17362125251.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/sanokujifozi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5f2cd28fc---28220045728.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/25415088410.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_off0000b1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A8 10760 bytes
SHA-256: 71a499cca86ce0369428596c69a613dde2e74da0f4a593995986895dc045cf09
font_01_sfnt_off0000ca66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 15076 bytes
SHA-256: e9177bf1ce5da9620f57bca7b217324cf1e152c91b768a5921862009e908f3b1

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