Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bdcb874e41d890…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 07:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2236ec5d58c14521a3a8bcb48a8d1e7 SHA-1: e2ee10367bbb42aee668a1a6f41c86469126c676 SHA-256: 92bdcb874e41d890608efc49a56c4a0dd159fc0e87ad758e3d68dd6c9c9c722b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to other PDF files hosted on various domains, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and potentially exploit vulnerabilities in PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/lokobe.pdf In PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/vapabejozidaxanutizi.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/20700310324.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/90541772014.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/42530853162.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/56747578967.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca8f7de19---98602418072.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608497d1ae645---81740545008.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/51066021056.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/78378691603.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df9051ed94d---xisumawisusixogerepodefog.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089a5259ec54---kedurepegipexojenab.pdfIn PDF document text
    • http://remobudostol.pl/pliki/mawatu.pdfIn PDF document text
    • https://effetre.biz/file/menowodu.pdfIn PDF document text
    • https://hoongnau.com/upload/files/wuserifefawepekabatumaz.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/fiwixasojeseniliz.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/vudevinupupakirugu.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f08bf105a---sogunemofovisapo.pdfIn PDF document text
    • http://megalaserasia.com/upload///midevitowunuroza.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607725200690d---62159889295.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/14483106892.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b34253cc584---82675028421.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/vizud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=god+was+not+in+the+windPDF 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_off0000c235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC235 17920 bytes
SHA-256: 9abd8eceda5b824a3c7c3e4cf135f0a044a8db3da1e2141d787ee28c1d926c9c
font_01_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 10324 bytes
SHA-256: 02c8c94e05ab7a59f2010cdeaf36d5324339fd7cb7926d470562e3456ee6b986

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