Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbadd03f3db3048e…

MALICIOUS

PDF

107.1 KB Created: 2021-09-03 02:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31359986b3c46832969b51d0bbea7a38 SHA-1: 0f3c6d5a490aaf8b9cdc16abfedb12639bb264d2 SHA-256: bbadd03f3db3048ebb35b6248b33665992f8d5033864aba98c2d2be9fdb16a6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and other disposable domains, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded URLs and the nature of the heuristics indicate that the document likely serves as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://nomylo.ru/uplcv?utm_term=introduction+to+international+legal+english+teacher%27s+book+pdf+download PDF link annotation
    • http://sieuthicayxanh.vn/webroot/img/files/51275185041.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/judiwepotanajejalimisiged.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vinifufigezi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/12d301abd6e775d19504ff5898066ab6/58429653568.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/xorujivofupowizevif.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/73kg7krtmp4v8i8c3asc2csk34/83964719850.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/r8torh6sndb293kofsbvs2omm0/xosogivemilopuxukirulebuz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/190272909e4ee98ecf45110748c9c6cb/pesagizarumebabadel.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/gerotilefi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kckvrg58l8uslr0u522a0chhi0/28047988792.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/venulufufabopu.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/14978575449.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c732adb97ee---53125748779.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/58857959956.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/32675015012.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30f640a55---27292313117.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/40203521606.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/49297536736.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ag7f7sig1n3ad3bm9omla2pae2/39574828299.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6a46c6178---latoteb.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/widaziwisusapis.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/98420046092.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qs3eu0uj3s8ul94235rnp02ghk/2331291999.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16072e37873f41---35614125113.pdfIn PDF document text
    • 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_off000134cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 11300 bytes
SHA-256: 37eceedf6f75232eb55c806ac409cf99123800ef214b9afa9bf2f77c12b0ce95
font_01_sfnt_off00014ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF3 21320 bytes
SHA-256: 3f6edbdcbb595e0734018dca8010038c16a0158c1d519d8b278da823462972f8
font_02_sfnt_off00018592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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