Malicious PDF — malware analysis report

Static analysis result for SHA-256 3088c59b65b52c7b…

MALICIOUS

PDF

180.5 KB Created: 2021-07-27 04:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85b3ec7846893b6a4a9ffe0db7f801bb SHA-1: 5e3194b0512726fd483ed2810a2531c1741699b5 SHA-256: 3088c59b65b52c7b20fa2963688b604e1e6ffa0f70627df1ec64553d0940e46f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 https://tese.in/ckfinder/userfiles/files/molimogikapa.pdf In PDF document text
    • https://omegaplus.bg/uploads/pages/files/fodegotemepesawunuri.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/50006342630.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf7c66f2e---xuwipanuvanukutiremara.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24d0f5d133---zerubujubalerib.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/66740555984.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cae11a98b---96800836013.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/12a2a39a7e3b7de519b67b42a71a7782/40079928699.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ba8b98ba---kusuposedusatonek.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/24624752190.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c98e080be0d---wakegen.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/deviwuferogipotulurez.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/7770734323.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec115b9377---weladazor.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/72923968259.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608931b5615c2---38242372244.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/91435830669.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/7084307713.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/welow.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098594994b02---56523140810.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/riwagugezofove.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vudugenofujevaviz.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608689f50fa1e---juxosajubarusakeruvegakus.pdfIn PDF document text
    • http://axwelindia.com/uploads/51171489613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hssc+group+d+answer+key+2018+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0351e0a85---90425085382.pdfIn PDF document text
    • 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_off00027ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000296f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x296F2 17104 bytes
SHA-256: 1ca9553f325516b1a9ac220b4daaefcc98744fe2266da4b646202f7f7fdad982