Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3ad1d4e94ffc04…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 11:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9267cb5bf8f280ac6dfd72ef9430f4f9 SHA-1: 3ef63238a1a1ca9f3c3028d910214b5af06ab1c7 SHA-256: 9d3ad1d4e94ffc04af43efca594b29f420c333cdd300be50799d0d2791722192
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign, likely using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 http://usaoxin.com/userfiles/2021-7/file/91725968443.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847e073f8d---nezakaw.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/sutubefojotevowiru.pdfIn PDF document text
    • http://vina2002.com/uploads/files/51014119377.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/80233434459.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f43fdc7487---zosonelijuluwojiviz.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/gafojodanexututolipozut.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/subupumivuwinujinagom.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6808a753a---46637973896.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728eb9c472c---74664035132.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/zagapidifokasuwepome.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947da365728---59220024700.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608904936aaf3---vowanuzofepo.pdfIn PDF document text
    • http://gibisch.com/files/files/48683127683.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/lelegelekapoxejoguze.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/9731217722.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116b64b534dd---16929155591.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/34134873903.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/nezodanigogoberavi.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/ad1554743595b56c4dd68ece1db539c6/kuwewuxejumazonorekuzoj.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f964fc3eab86a1c7cb87d9ec62dbbf67/50462939606.pdfIn PDF document text
    • http://chemicalengineers.ie/images/ziredinigiridudozadaxob.pdfIn PDF document text
    • http://riph.pl/userfiles/file/pukopujotatubiboruwagudu.pdfIn PDF document text
    • http://aps-mes.com/files/file/fefanelojowu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7c89b329---42565601784.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b5142c3f6---91559797436.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/84032739278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=a%C3%A7%C3%A3o+ex+delicto+processo+penal+pdfPDF 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_off0000c246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC246 17336 bytes
SHA-256: 0a388f0a69b45cf51db637880ee72911f618fd9d9b0f1b68875ef3d855574f48
font_01_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 11160 bytes
SHA-256: 5943654cee6f0318974da2ad6dfb032870b43ece2e2fe61852ea67fb7596fc7b
font_02_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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