Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b5912048cc00d7…

MALICIOUS

PDF

75.2 KB Created: 2021-09-01 08:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98f4ede966e74a835b6c3d677b3b8a63 SHA-1: d7edce75f3789dc8f1ffe435365a3f51bbb36136 SHA-256: 84b5912048cc00d7e4e95c2f68c4e7ef53c4702815b7b02e0f6ecf199c664874
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://tubietelbar.hu/uploadfile/14111004907.pdf In PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/silowi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/n7gtvptt997os5up6cl01fdmq3/xirutusoxubawenedasamolob.pdfIn PDF document text
    • https://artenika.pl/fck/file/90885123331.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/81236468803.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/66634391403.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/34072599532.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/51490070882.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/17383375178.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/porabizoveguserokakugako.pdfIn PDF document text
    • http://gtshotel.it/images/file/gusejuf.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609449364dd28---tujagigefuropigotive.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210828012216.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/33287772223.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/50499951959.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/75247983713.pdfIn PDF document text
    • http://qca.ch/userfiles/file/39284232895.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/70068089432.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d77b31e55---pajutopunedik.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/48738891651.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/dipaxo.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba455fd297c---faxobil.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/zosazexogosewawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=2020+icc+women%27s+t20+world+cupPDF 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_off0000c221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC221 16500 bytes
SHA-256: 07d9674b5be5499efe81d8a990940e512fb0d10e4394ef367e3538651b55c9dc
font_01_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 10876 bytes
SHA-256: 13171905cb8f704d602e5a6df7df48f6054d07b43a5af8e48bb611168f4d1b9f

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