Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a76b31c98ef2d65…

MALICIOUS

PDF

89.5 KB Created: 2021-08-23 13:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66102fd2e76bdbd245ab132e2f601f10 SHA-1: b010f50b22aa911ad9be6dc51e7e818cd8d8fbed SHA-256: 3a76b31c98ef2d658241903ebd141f967bf081d5be556929d249a174961a5b0a
164 Risk Score

Malware Insights

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

This PDF file is identified as a phishing trojan by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting sites. The primary goal appears to be directing users to malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5d84fcdba3b1402d1e5836fa6ec291b3/galegirewexejezemopubur.pdf In PDF document text
    • http://www.physedu.in/newsite/userfiles/files/dogaputabukapakeboxaf.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/dc9200b2edee2a494a247675ca88ce40/94108279764.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5cbb43282e042be2e68057847d7537aa/68774025782.pdfIn PDF document text
    • http://keramann.ru/uploads/files/74619716899.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/68645970778.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114798e3b08a---nunamatide.pdfIn PDF document text
    • http://koala-al.com/d/files/dinototufojabapuda.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2aa8b023---59092338258.pdfIn PDF document text
    • https://areicon.com/images/file/72316356580.pdfIn PDF document text
    • https://impresa-valli.it/file/20277527757.pdfIn PDF document text
    • https://horticulturenepal.org/userfiles/file/67535947773.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/38773474794.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/wulikek.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/17/file/20210817_191314_118.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/75148966237.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/40124531340.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9443491774---61266966283.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tijido.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d242gssqjfalc9ov30v4sv26q4/61496596858.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/55978822468.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/filolegosofon.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9dacc7a831962d320bddbf0d31994e26/xemaxukud.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/60798290856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=class+six+english+book+question+answerPDF 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_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 17496 bytes
SHA-256: 9af4290089a3d141b64d3c49f8628142ffa0f56423064650c4326193e20429fe
font_02_sfnt_off00013c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5E 11084 bytes
SHA-256: c6ae14024205aacc2465cbf448b4cf463b4b42f6d1d10ae1c55c2f2b4e891343