Malicious PDF — malware analysis report

Static analysis result for SHA-256 c609bb395adbe1fc…

MALICIOUS

PDF

85.5 KB Created: 2021-08-06 06:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 479658afb414b2a3b9de983d1d35b02f SHA-1: 4a0b99638c6acd6030f46ed2b569a754b40762e1 SHA-256: c609bb395adbe1fcea1c04fcfe26328be0494c2b1f516194f5644a008bb6a26f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links pointing to compromised websites and disposable domains, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8b35c25c18c2fdfff00dac0167feea11/gevijagezinemesak.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/sevevizikok.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/69263177700.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/kigunobevire.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc8a5584fa---jafimejepawipom.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/52797924252.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494c9481f8---36719664812.pdfIn PDF document text
    • http://ridendo.cz/files/file/54171585386.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683842e06c---kijinuwafoviwoloragume.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/35234339740.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/zizilara.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/luzeboxoxarotigivimeguw.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/64250056412.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/62369743487.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/k07uj5u8r3fdfok38ncf5lhu48/vajotu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac7c089b48---57014054707.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/kolawokobakamufo.pdfIn PDF document text
    • http://servmed.net/userfiles/file/96368009118.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/13832590192.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052508075216.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/josibexefux.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06db4ed51---sarivuzimiw.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/vadoxifamasidevikezuv.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/16489532253.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/fagowagawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+install+richmond+gas+water+heaterPDF 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_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 16568 bytes
SHA-256: 63369efe1a7cf126384575db062007df21c9fb8da48e8bc2e1c13159ee521728
font_01_sfnt_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 10896 bytes
SHA-256: e9278418d81c4655e8859defaf3f0760dbdb70ca5532a87c4756a756c9c01159

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