Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdb055fa82547ea…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 22:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b13b98b96384b5e2e5b3e953256f9705 SHA-1: a02346b5c19364c80b208bbe8ffb2007a7e4cd80 SHA-256: 0cdb055fa82547eaeda5d5997ba519b67ee724dd57ff4f0ef196d81bbe0bab97
94 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with many links pointing to potentially compromised websites or disposable hosting. The ML classifier also flagged this PDF as malicious. The primary goal appears to be directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7432

Heuristics 4

  • 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
  • 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://sparkpro.lv/content/file/gesagatanejim.pdf In PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/vurevodabatabegonarap.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/3953764583.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9a1fb1aee7f9b8587c7852643b0c9aa2/wapevevezupitagoni.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/6150968598.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161318e3041ece---12343127568.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/73873448916.pdfIn PDF document text
    • http://trieuduong.com/images/Download/laxiti.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/71066252151.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/6022861212.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371ad6e9730---17666608185.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/seralenuni.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf928999b---sobitulegoreke.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/venojamonelate.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/gujemuwigamazitimef.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/banemisabe.pdfIn PDF document text
    • http://chamdure.com/DATA/files/rarelaminuxuxalukejufepi.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dobugevovotulaveduzew.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/45811892354.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/bowolomej.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-9/20210909195727632852.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/78287538523.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/zinib.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/jedozuxijogaluberowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=password+in+roblox+2021PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 10632 bytes
SHA-256: 7bb6b445ffcdede20222756a713b2efd8799ab7915502e0b0f2270913c139785
font_01_sfnt_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1