Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9aff6d08c877af…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 21:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b4d807204436b7c914744f9d3fc2eba3 SHA-1: 1501a710035f52206dd683d9558d2316295c00f3 SHA-256: 7c9aff6d08c877afecec192bf15b4999064a8532817e95d62c2e5b5a9b63ca54
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of compromised CMS upload links and disposable hosting further indicates a phishing or malware distribution scheme. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=among+us+free+update PDF link annotation
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/99717915555.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/acbef9f14c7ec255e65673c35bbb401a/liropuwovizusulurivem.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/pezepigewirixi.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/34981880212.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/latedapa.pdfIn PDF document text
    • http://esejsc.com/upload/files/12447559807.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/nimelo.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/23724750535.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/wakorafora.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426fec037b1---datexalepaxado.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/72979262189.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/11003502073.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/mekilopevat.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210906131721.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/wuvelufa.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/muvafisejevidemenokijipi.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/xugalemusumamis.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed174f143---valakavisiraseta.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/titikininiwobamuvug.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/85292009784.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/komolodazuluw.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/10394602611.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/likumitolizozuxi.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/28043970186.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_off0000d27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 10784 bytes
SHA-256: 4a7200357ada352ede52468dd302f46bc8546de07ed87c2db275c0b236e33872
font_01_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 17200 bytes
SHA-256: bcc78e262fefc395facd79bae70e04a8dc18387cf0bae0e0b38d8787f8ff57f9

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