Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0be7378c8192d98…

MALICIOUS

PDF

69.1 KB Created: 2021-09-22 17:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 851d9731c2da120a5a8002e918c4b8ae SHA-1: 610ddfc4aa8f079654d3381fdb7a7949e9bd3c82 SHA-256: a0be7378c8192d986bbb1995c7f9a4070f464da6e6c7e6e4eeef7038713e1929
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, some of which are identified as potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests a link farm designed to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://hurtglass.pl/upload/file/97921679164.pdf In PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/85459926901.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/tinoluduzumazikexe.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109080505003996.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/93345245751.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe8f66818---vofajewolaxakig.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/vuzotudidoz.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/4907596916.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/69509175393.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/34aa537536bd890078e1e2f90b6d8b45/90103566038.pdfIn PDF document text
    • https://refoca.cenacat.org/yiicms/ckfinder/userfiles/files/jojujegakekogi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff220aede3---sotosojopurazemeduzaz.pdfIn PDF document text
    • http://parateam.cz/file/vodikiloxija.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/vezuzemerepopusirupudovez.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/76225016690.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/70610890527.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/ralolulaxonegikaxi.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/dabuwoxenawofumipolunaj.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4868ea4b83ea2ee6daf49b4fc3a08ab3/98320229982.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/21008813145.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/zukuxojinis.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/79685311513.pdfIn PDF document text
    • http://ukrfirework.com/images/file/46296869531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=justice+league+dark+2017+movie+downloadPDF 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_off0000af2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2A 14816 bytes
SHA-256: 5b50bc576ef83d8cf16b91bd08d21d52523e4fef3ea5c8834588c36bf68d3dc7
font_01_sfnt_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 11392 bytes
SHA-256: f1fc34626378be1162dd2ce9db11b442b63951c4071de0bbed29075fff288194
font_02_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1