Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe328fac478c99d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-09 03:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 771fd08c9c03fd7f93309e265211b566 SHA-1: dd1ee85e6695fff1eb14166741e1cb562cb75837 SHA-256: 6fe328fac478c99df9097c07f34b0801816d34b82d08034997285e5fb3780e63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many pointing to other PDF files hosted on potentially disposable domains. This structure is characteristic of a link farm used to obscure the final malicious destination, likely a phishing page or malware download. ClamAV and ML classifiers also flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://e-motorcycle.tw/upload/emotorcycle/files/60683127388.pdf In PDF document text
    • http://goldstecq.com/userfiles/file/40943691037.pdfIn PDF document text
    • http://recrute.fr/files/files/kiguxedaworivi.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/56308294695.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/revupijiduja.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/7540547292.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/bodedugafenulabur.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/10537649636.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/91908132696.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/galosabe.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb845d821---28156573083.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136c370c03e2---85803287689.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/59092924651.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/pibanelagobowev.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/37574756621.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/75294636689.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/99055524748.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/82400806541.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/8483f486c19927e66f64bec053f940ea/88741603344.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/duwebemiridunekibat.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/1556354807.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/volitewon.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1dbaaed2---putubidanujamudid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=calabash+hotel+migori+contactsPDF 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_off0000b54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 15256 bytes
SHA-256: 7fb44d1bcfdf596ad78274908c3fb8dfa0124b0c0263f5272327ca39e742a166
font_02_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 10848 bytes
SHA-256: aeaeb6151a856e8f0c5ea0da4aa3f76d81dcb8a4d4b6060e60dc44e28412a7de

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