Malicious PDF — malware analysis report

Static analysis result for SHA-256 d719d7761b36cedc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 11:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 68428abe1000718f5c259d6f0919a155 SHA-1: ccd16dad3c2ac018375b7b56c6f62c1ce4317cfc SHA-256: d719d7761b36cedce11ab446c70a932edff0f06f4ba076fa4c1b66dca8e7fdfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, identified by heuristics as a link farm on disposable hosting and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cs-web-design.de/ablage/userfiles/files/dofiboxudiwowazeratiki.pdf In PDF document text
    • http://handsonmontessoripk.com/userfiles/files/87209508622.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/lavijigapavolexafutesunaf.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614408be39003---genofi.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/wagoxir.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf9d96be2---xulalerimovepeputufajiw.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/jopogorirufefog.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/zutekutudobupajitefal.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/98796341665.pdfIn PDF document text
    • https://kapefashion.com/files/files/68447362854.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cc6e99d062e4a9b93250694232e8d5d6/17182865929.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/kumonijimunipopa.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/fotojatunodaxuzugeder.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/98325263518.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/rowulazulupotefefadulu.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/80327029275.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/xebinig.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a6f38d956b---97414901406.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/gibutoz.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/98523374171.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/pisozegitakeko.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/wukuwukofusenaj.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/bidimodinefizagideze.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/14041651245.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/sesipuroli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+auto+on+raspberry+piPDF 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_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 22004 bytes
SHA-256: df0783a072e9b7b523f8054e5f0aebf1444d40fa042791f3e65aa8217aab2d33
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 10676 bytes
SHA-256: 33f683fa745ee045f769c02cc2c0e2a0bba2d24190f868dd9458f09b52510fa8