Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad4a91169e363c3…

MALICIOUS

PDF

83.5 KB Created: 2021-10-04 12:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 72a063f08cffbe3626559ed0e3b09340 SHA-1: e570963b911bd5b9f8d26cb94d0b4c728f536f01 SHA-256: 2ad4a91169e363c30efd85c4fafd24333d5b8fcb0e6a518e88331a1c76ac2d78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are indicative of a spearphishing attachment, designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=too+tired+to+do+anything PDF link annotation
    • https://www.milestonesmn.org/ckfinder/userfiles/files/jusapomofuwawapegu.pdfIn PDF document text
    • http://mariancozma.com/_user/file/8743984032.pdfIn PDF document text
    • https://beylikduzutabelaci.com/userfiles/file/ritexo.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///rutopasilira.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/fejato.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16144f777582f2---zawurixojowajoxawu.pdfIn PDF document text
    • http://roocenter.ru/upload/file/42182661006.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/73019376080.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/tidizemugixog.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/dunomelutez.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ad266f7e4800d7d74bd24c0e702ea42/fenotuzukewabuluwejemaj.pdfIn PDF document text
    • http://szwygs.com/upload/70375324796.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5ab525a88---nebosugifizatafukupezeja.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/46389563561.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352e893d08d---risefujipuwetelanituriluf.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/senamumijixezekokuli.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156e88a1cf3c---fujilujawise.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/21368191512.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/xoxiwifaluzepezap.pdfIn PDF document text
    • https://netlandschool.cl/files/kudorigakivetibefexudoro.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/semotukumopozegi.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/83029462245.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/dekunakitazow.pdfIn PDF document text
    • https://dalba.net/other_files/File/tuladiwovivaru.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/8837834988.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_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 10392 bytes
SHA-256: 0cd18cd6a1d6e234739235709cf171fa8a645d9955ea756d5bde25af8b6c8a9b
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 19236 bytes
SHA-256: 955e31748ac6c59b1bf3e9b4d0cde4654af2b8f38119d7c91a36f86b5f109348

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