Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d93e2dad341507…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 21:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 163f1cefeea46305f6cd7144fa3e03ac SHA-1: 75bfa4a6a296b09cc7f4f81eaed439f5b79ffbc2 SHA-256: f8d93e2dad3415077ae2ce4eb2b8e9e9acc64aa98b1b51550f1cbaf7f0251aff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure suggest an attempt to deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://chcial.ru/uplcv?utm_term=how+to+get+out+of+the+boat+minecraft
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1a8156dc4cd8c6dfcaa950c3131156db/42485393019.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/fowebejan.pdf
    • http://hainescentreasia.com/images/file/fonedit.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gawanunivokujerolexabara.pdf
    • http://nicenpos.com/userData/board/file/28406951361.pdf
    • http://mpti.ru/userfiles/file/77774798860.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d63beb06a---65074473517.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/103b35c9203a3b5f302a3262bfecd680/girotije.pdf
    • http://painttechvina.com/webroot/img/files/87450760287.pdf
    • http://palyavalaszto.hu/teszt/upload/file/wagofeboxisumujope.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/16941410709.pdf
    • http://healhumanity.foundation/userfiles/file/97134315292.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/a9918d0f430a7a84c20859583660f5bf/27381305952.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a779e0e0862---bosojeregizawariwonanodum.pdf
    • http://at2apigroup3.com/contents//files/waragifipanenagojuzof.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adccb582abb---10875420117.pdf
    • http://krakow4you.pl/krakow/files/wenojegugedirotopavivom.pdf
    • http://romengo.com/ckfinder/userfiles/files/75900011968.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c521a4cce4---jukazoguwifewadisebeg.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ce4a144ee06e2d03692246831e68194f/mejinuta.pdf
    • http://rotarylaspalmas.orgdocumentos/file/beraxazufapetex.pdf
    • https://discoverthesky.it/file/tatavoduxumolabulizekiri.pdf
    • http://ilkyoukais.com/Images/Media/files/47093812772.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f797e1922b---mafexo.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160875520a37b6---xoguj.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/98257359721.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 16792 bytes
font_01_sfnt_off0001060c.bin
28470d2a897e3a4cbc9315f719bfabcc351bfead9e7ee5fbbe75b25dad3edee3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 16756 bytes
font_02_sfnt_off0001318f.bin
5943c1f024661e5c552dfc2b1a92c02063dad2855e78514f0acda895383fd20d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 10888 bytes