Malicious PDF — malware analysis report

Static analysis result for SHA-256 365691fb8cbef54e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 14:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9331ced07cc8f10a443ff121ccfd954 SHA-1: b228f4cdcc320a9cd25d8e1ea6f66ec1f1b93251 SHA-256: 365691fb8cbef54ef4c531f242c81349c0712a009e05e17221927113252ae630
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to direct users to potentially malicious or phishing content, likely distributed via spearphishing attachments. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=convert+radian+into+degree+measure PDF link annotation
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/77177091711.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/gifofutuvibobisovog.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/45027087530.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/17139545631.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/61691696075.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/33852725694.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc2f138e4---61344277985.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/42271298490.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/vukumuroti.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/gunija.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8debb16a---6449801231.pdfIn PDF document text
    • https://akemi.ro/hirek/file/gifinuwiner.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/700177b76799f25f769ff44c899c73a1/23317838933.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/raxidekamonapiwogulemu.pdfIn PDF document text
    • http://cabini.it/userfiles/files/gewomazag.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/912cf2610a7b5f843c6c0d2fdd3621aa/sufow.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/mosomefinetodemirunun.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/97c14d0e8d071b07aab76103c204e775/xogodajerufanag.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/7107866881.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/18563866726.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/peguvagex.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/62661686296.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/puzuxurefu.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_off0000ba12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 10744 bytes
SHA-256: 816b30178060c5cefd7c36ce73c4ae6d66258d9484ea0df8107fade86f04be5f
font_02_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16456 bytes
SHA-256: bcd8709e0c42ff1308fb11e450b185207259b7bc1d3f6906f4984e141b68c08c

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