Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b7ae87e5b3abc3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 13:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eee9454dd2d6e0d2a743e828ea99b883 SHA-1: 30ba74b75e098a9d9bd60119688c3675b6091699 SHA-256: 63b7ae87e5b3abc3488ad9dddd708137a49408480e29a8ac082959491872420c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://allytemp.ru/uplcv?utm_term=the+heart+and+the+bottle+pdf PDF link annotation
    • http://inwama4.vn/webroot/img/files/72646357671.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/783951591088790796706324e5f73c79/lateludaxorajetasi.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/pekavag.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/11085345829.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/97e613651978ad252a7cb8e5bd5924c0/98647828889.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff5a9f220---joture.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5359dc30---61354324991.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/39153047851.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/95214598835.pdfIn PDF document text
    • https://arerp.kr/data/file///72706088830.pdfIn PDF document text
    • https://umartravel.com/files/84522009293.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b71717d833---47003918477.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/wixobuwiral.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/bedopokebe.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612886f9dde59---35569871324.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/gotag.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/8889724411.pdfIn PDF document text
    • http://sushibelovo.ru/files/fukidudasepolow.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a33945924---puzolajidozemiremapobodeg.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/tulifo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/234ce335fd505e3aebdf2f119becf111/sopanivimafaxon.pdfIn PDF document text
    • http://sooclose.eu/upload/File/7465211986.pdfIn PDF document text
    • 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_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 10436 bytes
SHA-256: 8ec074ec7e811efa069c4f22ae9554c2ff0e5f692630aae7466516c9f5600cd3
font_01_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 18604 bytes
SHA-256: 8fc0a210098db903ee9d6a1f0716d11976d5e54245d7d3ac111c771defa8523e
font_02_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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