Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f986a84144f7ad…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 07:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa7c6993877968260210224a10cf5e3b SHA-1: e44959008bb0212bb12976b1e68924254ebd3a16 SHA-256: d4f986a84144f7ad472b31563ab7f04c8b9a0fce3dad3e24a2183c3388c3c2a2
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a 'download' button lure further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://unewstoday.com/task/userimages/file/luxog.pdf In PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/65898490626.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330fd7115b0---79364004773.pdfIn PDF document text
    • http://gewald.ru/content/Files/86182696129.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/xumuxopopubuwotazikibusoz.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/82664805375.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/pusopowexunigovalipoza.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/49498877115.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/1028945991.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/libaxudo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145a55c29008---67499445792.pdfIn PDF document text
    • http://iucecb.com/files/file/dosomifumazazumuzegatila.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/bitigawudupuninurujuribop.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/lefitiwuwegemuwuk.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/74319101683.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/bewojezobukagivewurivo.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/baxufilipinateju.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/43340805084.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/wapabimebag.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/63636121644.pdfIn PDF document text
    • http://asid.rw/userfiles/file/66442449670.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dbd8d36ac---pitozisusawexi.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiwofogijireneguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=your+excellency+movie+free+mp4+downloadPDF 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_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 11044 bytes
SHA-256: dca2811da286775fe1de414a2f01affdcea8b1d114914c745cc1f6136c63ad9b
font_01_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 17140 bytes
SHA-256: 0c95df6d50a18e57232f8ad0b31a25f9d9603166cd8c699e6ec2b86f2475cb57
font_02_sfnt_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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