Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f37c8a567635df…

MALICIOUS

PDF

79.7 KB Created: 2021-09-24 05:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15432a1ab4c640d0e91cf5b12774247a SHA-1: 433181ac6f2c7884b4e34207538a2ab980809d9e SHA-256: 86f37c8a567635dfe833ccc4d0d48698bccc342541cd97f2fe479ba975ef0992
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple domains, some of which are hosted on compromised WordPress sites or disposable hosting. The embedded URLs suggest a phishing or scamming operation, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=the+secret+sharer+text+pdf PDF link annotation
    • https://magiccat.pro/ckfinder/userfiles/files/jofamefitaxapuv.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/14530c35f028ae83c6fef91dcf64b5ac/55866967541.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43bd27312---47806418213.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/zerawuwokinejiparetukako.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912205911.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/geraledaso.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/retusagid.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/39434206641.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/37257566042.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/57137452240.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/jikiratanumosukez.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/6675587781.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/wigisimitoko.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/23854519817.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/26598109700.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/kefasesimozag.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/sufumodemite.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/tejowukariwumamonava.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/23707214169.pdfIn PDF document text
    • https://shunnasato.com/fuxor.pdfIn PDF document text
    • https://cooperspick.com/files/ronipabumip.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/40335152828.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/sigojevafizusugipiv.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1198d2fba20fc981c4e4beff591ca21d/31421670824.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_off0000d4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A0 10420 bytes
SHA-256: d4e004419cc2e79ca72a098e2e6a8e2bc8eee70f7b377ce9b158f3cf655882b6
font_01_sfnt_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 17692 bytes
SHA-256: 44b2b3264673fc4914e1368e30a0b43683362a9ba655ae839e9a3ea1419c3ff3
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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