Malicious PDF — malware analysis report

Static analysis result for SHA-256 482f6ff0e641592a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 20:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25d94d9ba29aebc679fb4acb13c381a0 SHA-1: 81ba9eb11f7f3f42c7ad6e162b67c184db67e20b SHA-256: 482f6ff0e641592a40b06e62797bc4fa30dbab6a8fe78439836738cf13468e57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the file as a link farm on disposable hosting, reinforcing the phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://conexus-study-abroad-travel.com/ckfinder/userfiles/file/57202213786.pdf In PDF document text
    • http://shijijiaming.cn/filespath/files/20210904081822.pdfIn PDF document text
    • https://ratosatu.com/contents/files/guguvokusinafolijokigepew.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/2693827062.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/sanepikovowuga.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/72202676296.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/sulelorokagosuvodaxaz.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/43073909130.pdfIn PDF document text
    • http://lgassociates.in/uploads/16256259955.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/41994844358.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bec794272---lelojimosanenazopibuw.pdfIn PDF document text
    • https://scalping.ir/data/files/file/86283229791.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/tuwesipajikusexufom.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/27711636304.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/vujabupulegelosof.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210906_58a7a.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/venebijovuzorifevuwa.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/bimojitavolevatarab.pdfIn PDF document text
    • http://eksternest.be/images/file/gezawomawewegajolijegimu.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210903150600750787dg271g.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16135be8825712---52920778580.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/2506417006.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/mirovumexenutufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ecosport+2016+freestyle+manualPDF 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_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 18268 bytes
SHA-256: c356dbeaf8d94ce9cb37158ec3eb57ed314965222ea164b6d9cb320991213e56
font_01_sfnt_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 11208 bytes
SHA-256: 4dc87afc66807523175cf126d50e514814ab481b1eb999e3b053dbacd993a099

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