Malicious PDF — malware analysis report

Static analysis result for SHA-256 af27f6e5918f43e9…

MALICIOUS

PDF

71.4 KB Created: 2021-09-21 05:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3607fe67e7085fc8112df93115660b39 SHA-1: 660074de8951c292ef28350b4be65247c23f0317 SHA-256: af27f6e5918f43e9e6f5ac718a3e866ad54cb35e731982ee62b51c6b5dc5efaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • 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 https://infoenergie-loire.org/userfiles/file/31223566885.pdf In PDF document text
    • https://fallsplat.se/bildbank/file/26772249081.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/71110098440.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mokutoz.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/webagerutir.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/walomenuzajanebim.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/17363854144.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bbfd12e87---93712773564.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132b50ddf5f8---41931083106.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614666d4ea463---92111703131.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/21404638457.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/34248361240.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/37441915606.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/1524410280.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/jomelodapoduw.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/60764551643.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/76498440044.pdfIn PDF document text
    • https://adikkedua.com/contents/files/11556771774.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/pujorafoji.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/88885becace47f210de4be61900ac17b/16405249760.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410ef350cc1---difuvidegapumi.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/8438153131.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614118dab316d---71845408322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=shiva+bicycle+racing+mod+apkPDF 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_off0000b407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC19 16380 bytes
SHA-256: c8ebd8a2b21565c4e377f98862ee32e5dc446eb3b323762b449200dd2f09ea19
font_02_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 11184 bytes
SHA-256: d22bfeeee869bf1edfde0f073843d4a3ba176cf8a6ff5c06fe35cc3cc725c114

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