Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa662acee5dd07d…

MALICIOUS

PDF

71.3 KB Created: 2021-10-02 20:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9e979c1d442163771abb48e0bd6a523f SHA-1: 05882ba03c7ff196fa99f4a07078fa9e67366742 SHA-256: afa662acee5dd07da17a700cd94da66731670c9630104aae15121f2374d0b467
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple external domains suggests an attempt to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is designed to host a collection of links, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.hgekc.com/media/userfiles/file/veneburebotem.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16144b92d5f86b---nuvanazetadawukuzaletolu.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210905_2C03960EAF98FCAE.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dodedokigiri.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/44693461260.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/nidozuzojonarowafuvuvad.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/648405806.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/97663746826.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305c4ca0765---34013597047.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/77356909601.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418d140a8cd---golobumuredefoporawusowa.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/26192498559.pdfIn PDF document text
    • http://tyextractor.com/d/files/nutejaliseku.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/xekuwuzisapedoxul.pdfIn PDF document text
    • http://hocomesun.com/upload/parafinubatutozatix.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/74588057325.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/duviwikosopux.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/zixabok.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/xavexifisobaseteseru.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/88879871523.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/jorokapubinifiborakekiniz.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/61951447385.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a8164dc92---nunavep.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/mujudonilupaxifa.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/generavadevago.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/37469555789.pdfIn PDF document text
    • http://xsteelstock.com/d/files/jodosupazujopi.pdfIn PDF document text
    • https://sainaudit.mn/File/wilijen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cast+a+deadly+spellPDF 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_off0000b80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 15960 bytes
SHA-256: 1ddd2897bb5b9876f39223453deb1ed82f09a1147f2f84d51cfbe5934f980aa8
font_02_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 10112 bytes
SHA-256: 507ced302ff8fdda80e9958cc0f6ff6158e21fd0bf5b44e7ce93fb221e1c2891

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