Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f3ea515f3fb33c…

MALICIOUS

PDF

110.3 KB Created: 2021-08-07 23:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92f4c5b34d32e19329536be2270ddbf6 SHA-1: 46048a3fa314eed1142023efca46c228893a2cef SHA-256: e0f3ea515f3fb33cf036000bfaffad4366681b9219b7e923918d1f6e1ec0cb2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself is also noted for duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://dok-vo.ru/userfiles/file/72218677089.pdf In PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/36504311220.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/90275c5df11c57b722ba39574b9222af/48222799507.pdfIn PDF document text
    • https://led7.ru/file/33004529665.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/milas.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ec97de2c7---kamim.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0ed082a721da4aa0563fe84dbd30dd9c/xosevotolijumajubina.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/fazuxovefasudorupoxotaf.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/97675842395.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e115d21452---fibedavufavegonojumuke.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/dq8urmhn9eo51nbshj5gp2tp1b/denuzimigef.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/30280267767.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/60859284385.pdfIn PDF document text
    • http://iltorg.ru/upload/file/96567461380.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/dv3phm59nq9jquhf1loaqrd0f2/84578352172.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/62448559f53b2bc5e602aed77bf6f596/totakonulipape.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9103034d4f---vefofetaputefedosekawi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/54119102698.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/21f3302093d4a6ef01d89f27ac4bca13/sazibip.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fda2ff7284667651a4cb6748c2a72ba6/wimozajalojodozazasoda.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df653b59954---41171961810.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d16193f57cdc8a106b177bf0d60f4a43/kinotuwogewino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nefrologia+clinica+avenda%C3%B1o+4ta+edicion+pdfPDF 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_off0001460a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E21 10952 bytes
SHA-256: ce9b6e2cdf25d9019c69cb34deb443316b96a4d3eb43de40730446fe4253d1b6
font_02_sfnt_off00017741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17741 18760 bytes
SHA-256: 787273e3b2c831cf39eab21fd88369b0563f7596b95bcd472e8f436de48ccab8

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