Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c00584c844c40f0…

MALICIOUS

PDF

99.7 KB Created: 2021-09-05 13:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d45ac07701716bab9ab856f39283aad SHA-1: 2f0126946983217ecec3685d8ca3d3f3aa4a97dd SHA-256: 7c00584c844c40f0f95013bf2e8f28c70790cc5f9e3066b17ffd1e6833d9d785
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being identified as a phishing trojan. The primary attack pattern involves luring users through a seemingly innocuous document to external, potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160850f4ab93d5---40176496884.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/lusinelexejowewisafes.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/a1o7c50hdjr9ke8l39cspjfnvk/46790858022.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/95eefa82cac70d755830ea364c15315c/40904484980.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tobimerivifopadam.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/mapatixokok.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/nasoxapufexunor.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/bafiradixex.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b79109d6cce---finado.pdfIn PDF document text
    • https://avflash.nl/upload/files/16506548929.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8edf281639f2de5421f201f2bf011588/wulazeromewebupininud.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/vakijomenimeb.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608886aef09e8---wokerumovebabemigowilagek.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/xitewidibuwewed.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/tepufobumupurewekoribi.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/79876160863.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/gijerofonisapovipitewu.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/28157263821.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/gelakekerukatusovakubu.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/bidazeguzuse.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/36011486572.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/97522892170.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/05e7c9087d9dd7a18550a342cd5e38a9/fenufonedajijixipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=aleister+crowley+magick+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_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 11132 bytes
SHA-256: 2263a41870611a79e312a0afc7fa4255d60c4698083843a179b04d7cbe326b70
font_01_sfnt_off00013698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAA 19772 bytes
SHA-256: e52c9750dc2da2c9417fd59b28528335b02b064ad14a90d21e382fb11de7f857

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