Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d4886a566b697c…

MALICIOUS

PDF

68.5 KB Created: 2021-06-25 01:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1342c8499700f0d95d1dc666990dc023 SHA-1: 0f8282e8e83dfdb30536ce5b44c6e696ae2273c6 SHA-256: 98d4886a566b697c0e02bed412374800d8b67346b77bde3ee381db8aa498a331
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dbjadow.pl/attachments/file/vagebutufisuzewegi.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf625ed557b---15625632064.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ccc9bf558---rorawamitefeporejo.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/vunumozixama.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/3492bb718fd5f8af7b901e4e61020d51/98195377481.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/89792460098.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/62185273302.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a5baf44b---gexopuvikalone.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0067360d---zaronuvasepuwazew.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/rufasanujuvumefigur.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783964ef273---60473928496.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/64069649536.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/m67ru2s55dgita4er3ngo75051/75833899703.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fe39b8f0d---63525226582.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a8a2f6193f7da74fa8ecc6b8c22a6306/98850252362.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fc006fbb2---lifanabewapekidatimil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=convert+online+pdf+filePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c9579c829a175d3ed8c2a1f94980ebf3/bunekire.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 4612 bytes
SHA-256: 626c9ff49d2ef78d81585a1048191eb6ea2087d92dc777686859a6e627cdf6f5
font_01_sfnt_off0000e06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06C 10824 bytes
SHA-256: e0235bfb396885916371c65ff46278cd5a4aa8cc8205e56c63723cea2dffa699