Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0f4bc692385183…

MALICIOUS

PDF

75.8 KB Created: 2021-09-11 08:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1add767e4f2de7a831e6d3fd0585d120 SHA-1: d7a9f8378a26390d97948ee0f3a8127c1b892c6b SHA-256: 8f0f4bc6923851830d9713331776f058336ae2c462964408e0085e613d8a9bd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70886494471.pdf In PDF document text
    • http://brkvinc.com/userfiles/file/lovusafakirowakov.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138b928ac611---73190925683.pdfIn PDF document text
    • http://spiregene.com/image/files/20210909_221738.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905155440.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/lotubixowonowok.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380e9050883---retenuxapuviwerixuzizep.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/98520890684.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210910042802.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/80448281276.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/divabonenoxasewo.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/dugilitalu.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/90865373398.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/poririzove.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/71309179225.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/vavekeriletavuke.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210902_132142.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c63e142b1---13022301055.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/vorotanabozixulizalin.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/sovamobupudigaso.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/paruzegopoduvowokirabelin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gazi+tv+live+cricket+today+nowPDF 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_off0000c5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C7 16896 bytes
SHA-256: bfb01c44b85ae6cf54bc8ea089e28a6bb7f46b360a0868c7c544f60a1ec47a15
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 10652 bytes
SHA-256: b971fce5cb2b3bca94e5a81086ef86348768862d0d1d1d3ceba9814500f77ea1
font_02_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1