Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9afc34d544e46a…

MALICIOUS

PDF

89.4 KB Created: 2021-09-06 06:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 312969770266b8669c9cebf993c33b70 SHA-1: efdb69fb9eedfd34fe0857fb8b2397544499e8f6 SHA-256: 9f9afc34d544e46a12998f2c8e05a830d3c9e2a1d8ca38c8dbf429b4d4b2a2ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/v7tvptgp18q9ingfinvh6ts979/vozuse.pdf In PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/borenirosi.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/63310733234.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4n08a15vls566q5c086dbvv20k/71286179551.pdfIn PDF document text
    • https://huanghecables.com/d/files/57855496491.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b3cc1ea8f90a45e3a704becce4c02c51/84544049671.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607846e065053---zaxigoxapekinolago.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/67181969651.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f9bfc757816f62b7132622c4d29d9e4d/mufinuzozupuwivaw.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/41432199397.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/zikitepo.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/66547087186.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93757339055.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/tuxizifewod.pdfIn PDF document text
    • https://digireg.com/upload/detinasaki.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/kanarumafinikavazofavozo.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/puwup.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/98gsp1fbllfkvp2b76hv9rtb8i/jilakolavufutodokufazo.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/25524706525.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/duwaximuzonixegitipeka.pdfIn PDF document text
    • https://argumentua.com/i/file/39056936432.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/77002475939.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-8-10/20210810062906227708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=knowing+god+ji+packer+pdf+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10780 bytes
SHA-256: 8ff633e1c3edf667aca988f5a967d6fac5afc408bcf8f46711e35916ecb9a932
font_02_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_03_sfnt_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 20040 bytes
SHA-256: 55fe107b5fd5e0994cbbd63b3032218f4e0161fa6577522cb6c51ee3324bc53b

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