Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ae1c66caa5d7b0…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 16:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1f1234d56c0ea444b9e12ccd178c8dee SHA-1: 7f748c2a2e9bf74e79f161b3a4ef393de807b3cc SHA-256: e6ae1c66caa5d7b0662fa4c59b4c0d139010132f0e87e320052680b7d42b602b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=anna+deavere+smith+letters+to+a+young+artist+pdf PDF link annotation
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161115d3f919a0---jakajev.pdfIn PDF document text
    • https://bczenekar.hu/files/file/62490062848.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160766673de509---88892249299.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/3616973277.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c146e431487---jibado.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/50103579602.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24790217009.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/bogixebitokebelafelejut.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dea3821fd---42340902419.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/murufapibosedomixoruv.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/37027370095.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/80071619630.pdfIn PDF document text
    • http://texmet.pl/userimages/file/wimatapi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67af22d37---34389559205.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d04e79ac1---30245667669.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/xubevix.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de9ce09437c---sapowoserawezavemadejopi.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/tekuxasivemodubopizipo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/58c1aed5cd283e9aaa6c7353f7f25fee/fibemukibawamiber.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae9bf70981---bawujavavub.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800ccf2f03---rofuzadojobipe.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/af6b69e631b4fa32a5f9d1e1d49fe746/posafuzinatarutovikoziw.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/18078993270.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/5063222218.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_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 18392 bytes
SHA-256: b865cae52b67582f12cb143ebaa50d4b1b424ecdb39d16e1ed4bbf3b3d4e1f10
font_01_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 11204 bytes
SHA-256: 07e7461d28ba6f62a275b61a7df930c54c2311b50a9f9993c456791404646138
font_02_sfnt_off00012fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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