Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ba97c0cb081711…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 22:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b94ff3c66fdef4390e214349aa1175b7 SHA-1: 47f3ae0dfbdd77dd395cdcc622bebf46acbe26c3 SHA-256: 42ba97c0cb08171137f2b2bc8166d81680d2c64f24e6e8d8760de41517a27137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting and compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and link farm heuristics suggest it's part of a phishing campaign, likely using embedded JavaScript to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8f0b215a2f301fc987b39899f536942c/tudozi.pdf In PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/91959043974.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/jonilewudogo.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/70540120219.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/jigib.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/32056444122.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/nowiwibidizax.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/vugopo.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jowon.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rn1kjhogscoo0osfem8v4ia9b7/bumer.pdfIn PDF document text
    • http://netart.hu/userfiles/file/mifusuwanumonutefo.pdfIn PDF document text
    • https://rotitelor.com/contents/files/torukavezufeluxebawow.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/wemivuwojase.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/11745153849.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/golixenuxubipibuxubogizu.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/36177876238.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/37d08752cd3a2b69ad81b309712a5360/99008231186.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/jokubewivope.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/sibudufigobopijiziralisul.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/tutudizawofuraxu.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/kanajesepobuni.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/tulodetoxinajawiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+songs+for+ringtones+2021+englishPDF 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_off0000b272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 10676 bytes
SHA-256: 1838ce2d783f3a78d8584a5cc831c3513138f4b1cc7f99d1cb85e0227e9823a0
font_01_sfnt_off0000caf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 17608 bytes
SHA-256: b5ac4b7401526d5708989013b29c557fe66dd3fa41fab28646ca7bcb2b9af42d
font_02_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1