Malicious PDF — malware analysis report

Static analysis result for SHA-256 2371cf09ec14c093…

MALICIOUS

PDF

98.3 KB Created: 2021-07-31 02:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: f0a2a9ff2bbd497f6be8f49122d5f58f SHA-1: 374c5120e5acf61133a61e202768175645d54025 SHA-256: 2371cf09ec14c0934704e45584ffa4ea6e3508e43ef09d0c7aaa0ff86f1d0693
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to link farms hosted on compromised WordPress sites and disposable domains, designed to obscure the ultimate destination. The presence of these link farms strongly suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://tranhdaquydep.vn/upload/files/17873232030.pdf In PDF document text
    • https://emauto.lv/index/images/up/file/63476707084.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bfd30bd5c---lofasiropili.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/josezimitebekufep.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a37301bbfe7---gujumunexakezifebuwomefop.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/ab457ec0963a14a216e7039b75a199fa/biremadomagu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/e5no039r6380a0ebiui8glg6aq/25157653945.pdfIn PDF document text
    • https://bem-sa.com/img/file/tesofuwibovetebozigiz.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/53701231300.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/teberonezepezef.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/96113281052.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b71232416bf---ruveluvorabo.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/nigiroz.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d054183c704---wajizanalul.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/73rocci8cjaf7cn81m1kq7dj0c/busaros.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe7beddfd3---lowuganiv.pdfIn PDF document text
    • http://calisnt.com/uploads/files/56251196507.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/19418376414.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e38b7c47fad---97124935481.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf06cf4ba---32833705583.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b03dfk6f4dqskfkoalmlgq2p07/loxenipivilu.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20574833050.pdfIn PDF document text
    • http://sdes.in/uploads/90828432787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=2.+de+tres+definiciones+de+econom%C3%ADa+y+diga+sus+autoresPDF 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_off000115ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115ED 18944 bytes
SHA-256: 92c00fddb095a7dee6f9838f0d008032e432476c33eb3d535d8bb6d4d20ff2e9
font_01_sfnt_off000145d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D5 11140 bytes
SHA-256: d43bf0d7727d193f6adf28f13f13db8a692322e1fab28618311603421e3565f6
font_02_sfnt_off00015fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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