Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0cf1e08b24a1b5…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 01:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d225d5ddffad37cbbb423c5b96f20db SHA-1: 03318b6e2d105f2a829f502ffddd6f3b8ca1b8d0 SHA-256: fa0cf1e08b24a1b52b7073284d13b7a79ba346cd3425646facf19a410239e1df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of external URIs and a link farm indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/840dfdfee0746d4ff2493c63e83bf493/zixetadu.pdf In PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/gigakijenema.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/63655780379.pdfIn PDF document text
    • http://www.moyekolodin.com/files/64622461097.pdfIn PDF document text
    • http://protok.pro/upload/files/vosiwivu.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/84727510505.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/21634833927.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7709df94---56697421636.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6cti8b2e4a3qkukv8je97g11s5/momidasuwuduseli.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/pupujirewunoletewe.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/irte1alcthpkc0qokpdg7t2862/77045220444.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/38275003020.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/sipijikikof.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/3523769221.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a84f4f102---gisone.pdfIn PDF document text
    • https://rjpexport.com/files/86093575958.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/lugaruxaxotisimudegowid.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/19637824108.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/wawimukepugexo.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/mevazalivid.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/mgranvafsq30ii679g12b7fnj7/46150726811.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/topasegesibopur.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfaf43f9e---pemabomidomuxu.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/51497397931.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/pilukivusoxigenetiwefifer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mouse+recorder+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_off0000b570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB570 16024 bytes
SHA-256: b74c0174dbfbecafeff2a0a5e44c0cac45c892b07c206538316b1e6f0c37c929
font_01_sfnt_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 10312 bytes
SHA-256: a638b369dee04c230c7bdd29e7e61925359ece4904503903a0d3b7b6155ddfdb
font_02_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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