Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6db17f255961d2…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 19:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76408ea6bb2bbff0f7f9845cd6619766 SHA-1: af2d38ca5b9ad3f13938271453517887e7c228ce SHA-256: ed6db17f255961d2cc4c84ccb6ad0e3635874312bfd4eaf469fe888fc9f3d9a1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://samngaimarble.com/html_upload/file/lebavatunaxijeto.pdf In PDF document text
    • http://greece-ex.com/images/blog/file/webesevozewajenedakavuzo.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/11619062492.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/5613155217.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/rupup.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/79138773056.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090513465973499.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/44170671048.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/wexixosagofare.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/vebojugibigifevof.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/lofuxaluduwodedirelijeb.pdfIn PDF document text
    • http://hainfelderteich.at/45084850846.pdfIn PDF document text
    • http://gptools.net/userfiles/file/22337870617.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/82325689711.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db32f2f26---lavul.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/miveseperijuropujaj.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/79805675260.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/57071790173.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/zifilonugez.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/11194653935.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/2723579151.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/lkgbnherju63nkkt1cg14tk8oo/55456383022.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81889920178.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305a18a818b---vilasekofuzip.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/63629756125.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/lulimopofabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lulubox+bus+simulatorPDF 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_off0000bed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 15576 bytes
SHA-256: 0b671fa16c6cab1eadb8d0f974afa175fde482781c4b03fca3481efcea8f9770
font_02_sfnt_off0000fe73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 10332 bytes
SHA-256: 1f42af9eb1dbd28f1b6254a6ca872a13cc85b98488dcc92c25ca23fa893c99e9

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