Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edd2366e730b862…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 07:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 70aacdc56cb2a04ad9df532bc1c3516d SHA-1: 36ed0ef369fed8c1f102fe77cff92db1b3cce3ed SHA-256: 3edd2366e730b862f6f264a43c71d679808cea4661cc997c65f6799b7a203464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://inwebjor.ru/uplcv?utm_term=katalog+oriflame+bulan+mei+2019+pdf PDF link annotation
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cd00bfe59a4---88069125201.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a0890e36---zowafawaruzazit.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611357414d915---72620101263.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/bovirunaxetovorexi.pdfIn PDF document text
    • https://vestol.bg/files/file/27180612523.pdfIn PDF document text
    • https://avenue102.com/uploads/file/79500469701.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607775a19f37e---95372378700.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cc92c81d74c82679b089675c282356f2/bifukekinoraxub.pdfIn PDF document text
    • https://ebooksweb.net/files/file/30934342745.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/vubanuwul.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f8899b720---faloxum.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/93280233705.pdfIn PDF document text
    • http://seritour.com/rsm/files/44963540026.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/saposofotigugu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bdf6acd94---90763515732.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/ludopuvigosetot.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/2060091899.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/36366427317.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ikvgmjpd1tg68e5isn7isnm93d/23133791882.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210619095346481.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/9467268619.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfcde3d21a---12311926804.pdfIn PDF document text
    • 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_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 11368 bytes
SHA-256: 8a53cd08297abad4253fb32efe737a7ea2a859a94864da0f93f2d31c794da675
font_01_sfnt_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 17540 bytes
SHA-256: f7f0e8f6f08f863f7b54ce40e27ddd9ab97212ab9cf7a03c1d722cd969b6eb7a

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