Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe9ed1424bbca0a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 12:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6271bc7cf30ee59f8f4dd35064a86564 SHA-1: 9f37c5681b9b33bced7b34c41866f9dffa6e9c3f SHA-256: dfe9ed1424bbca0ae20f06aceda5d9557e80f891b4d8e3ed1c20c635f1c9fb33
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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 https://krisoc.ru/uplcv?utm_term=cara+membuat+daftar+pustaka+dari+buku+pdf PDF link annotation
    • http://klusjesindex.nl/images/uploads/53242216759.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/vevuvenuvirutobo.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/90042758639.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb683043e---diwidimikufilanevoko.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f9e0d2640---revaruludokulevik.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/72543447871.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093d266d70c1---dojekegimixepurejanuj.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/8925524227.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/wenipipuwisetop.pdfIn PDF document text
    • https://schmitz.cz/res/file/gexaviwinamijetaxuvona.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/15912712210.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/magamafudipawafedepiwej.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a0851689cc5822ee164f98a2152a45dd/6804990297.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/garedotexiri.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac407dd8ac7---wudoguto.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef32310c1---rutekararobejezelixava.pdfIn PDF document text
    • https://yuss.it/file/nujemuvagiwapoga.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qj6e5ban0brs261lkegu86cup2/xabafexit.pdfIn PDF document text
    • http://dycmc.com/DATA/upload/files/202108130558523532.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/nunebowuzikixawulo.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/94242327032.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/70623102996.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608acfc88e44c---gasozo.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1869120343.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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 16828 bytes
SHA-256: 1f4cdbc92401ca8cfad1327ecc7c5f72bb9b6ef2e6329251cbc26da5b8b2cf3d
font_01_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 10752 bytes
SHA-256: 2534aa604bba21b4f646396c1abf2b677fc901149bc176867d2336a151d61e89
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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