Malicious PDF — malware analysis report

Static analysis result for SHA-256 d488a89af49168be…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 00:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 775e585717ebc94458f0325328176199 SHA-1: 2dd1228900bde8f31ff093a4788d1173c3d1230a SHA-256: d488a89af49168bec0385a2c5d7302f4c4de6b30193cc29d6920422f3ebf56ea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://195exim.com/datas/files/70758020295.pdf In PDF document text
    • http://kahasat.cz/data/file/zafuwitufozekatilozixapu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161376ec66a2e0---welodipub.pdfIn PDF document text
    • http://finchamauto.com/pics/88106612762.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd4d1faad---38051547434.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/bolasexalotarabirogiko.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/65232345613.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/76df2a9d7326c7ca5119b23de52fe495/poxaxoraximasoduli.pdfIn PDF document text
    • http://zenkatsu.dk/files/mufun.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/24561582105.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/gesufululov.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/56252721908.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/84422853345.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021912544167756.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/42739462795.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/41259371225.pdfIn PDF document text
    • https://digireg.pl/upload/riwupowuwu.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/71132256257.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/18338032839.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/23659991615.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/guvusavoluforo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136922248042---tavazidanos.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/jutofinelotepowabaso.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/kebiridowavog.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d1c14661c5a99dcc163db9c149f4e2e2/sejevivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bookshelf+app+for+androidPDF 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_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 17996 bytes
SHA-256: bf4b039bd0912287feb63797728584bd3789a0845077e3cbd491839f44df9757
font_01_sfnt_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 10644 bytes
SHA-256: d4f7fc4e0709afc9b66261ef4449f5c66bf59cf9c75d32b6ca9f802dc9da0d66
font_02_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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