Malicious PDF — malware analysis report

Static analysis result for SHA-256 1377b2a1aa0e955c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 16:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19c5a109fc874364ff0aa14681a70500 SHA-1: 1220eb0260cfba664f7c7b6f269a581e1859bcfe SHA-256: 1377b2a1aa0e955c6b5d39e53eb8925fb7e317cc70546509f70d0135ceaabf11
164 Risk Score

Malware Insights

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

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites and disposable hosting, suggesting it's part of a link farm designed to distribute further malicious content. The presence of a 'download button' heuristic indicates a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0723c1d923adf861ae92ef6330114a4a/59109890238.pdf In PDF document text
    • http://nguyenxuanhuong.com/upload/files/xejekox.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/57945656772.pdfIn PDF document text
    • http://trubaopt.ru/content/file/65298784905.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383911c82f0---fekumafato.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/eaa3afb81426dd4076a6082cd9b35d70/vosarapimidod.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/tisegukimilavesefinamuj.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/ganopagesazapasupepode.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/jumososusujejuvasi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/591c820dbe5807fc0507ff686299fd78/wudiru.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa0774144---xosepozupexidik.pdfIn PDF document text
    • http://offerparts.com/upload/files/tujipusibabidunil.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ba7ee82---kowudaxixotiwal.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/33800964406.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/lexikunupisavakam.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ud4t6stq7fs3mu9lpfsptplhn1/pititevotubipew.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/karekiwovusaro.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d60d92105---suketeximu.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/lesedatavubikidavaf.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/75477580990.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161342703a1604---46619369323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=among+us+apk+new+versionPDF 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_off0000c6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 10776 bytes
SHA-256: 6fc67a41b1ce111ce26ea39616d78445cdaae6ff55b9fc0214981a5b93cdee93
font_01_sfnt_off0000dfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 17708 bytes
SHA-256: 81b586589430d91eb77bfdf4e3b62902b6ddd57e38f58a53e3b11b52d87815f8

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