Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6d8ca8aa795361…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 19:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08e81908c0496f05023a90ec6c4b4c39 SHA-1: 00a3a9684da65c0e175d4b166704f740c0dd7e28 SHA-256: 6b6d8ca8aa79536133d0d4eb766c84798b03f5c7df57c47b7bfe359069483116
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms 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 via these external links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://augsburger-dartliga.de/uploads/file/mezimovavasarikilek.pdf In PDF document text
    • https://zzhqhi.com/d/files/xupelaru.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f3fdea576f83be5fd5c479ab6d94040b/70335652409.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7d0060d51056e2aa1ff3c25e5a8d5d83/dogoviwufira.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a119f0b5dbb---24555628742.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef304171a---70248139799.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/dosixapuri.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/69380171608.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/29736777655.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/47803e3a177eaf6acfa4705b886c8f54/vozidiza.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612944cbe33f7---17214004924.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f6a99acaa0feb8bf2296e58bf0615994/rokenuxirasonuwera.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/zotovukategovilebul.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/piwexomod.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac7e76edf---zogixanajoturetezefovo.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/54560307876.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/dobololinurefaxujexu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/48f22844d7fcafd711dbe651ee50e280/98377796884.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e4a410077907b992e581626d3e8f55f2/85330968392.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210704_E15EDEC82974F845.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/uv4ig4of4hvuu7s6ki938sg32s/33285919481.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/77867966218.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/mitafugeruviwotojag.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/vepemavubugokosazijewum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=brother+sewing+machine+vx+1100+manualPDF 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_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 11260 bytes
SHA-256: 80a0930db8fd3f441c583c16c4866301d657290eedeb2452f439cd9e2b4b9c0a
font_01_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 17112 bytes
SHA-256: 8f947b304a023ee1e3c58d3a256d9e61c66686c2ca6317e4f759ecb07f0dd99f
font_02_sfnt_off00011d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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