Malicious PDF — malware analysis report

Static analysis result for SHA-256 6631a6c02f6a57bb…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 10:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46981565035a4b001367fb5eeb8ba61a SHA-1: be02bd658e592b671cf14f2e299a722c751c2f58 SHA-256: 6631a6c02f6a57bbc9450111eb7b69c4996a6ef0f99252f20bb7c02e2371d02b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. Several heuristics indicate the presence of link farms and potentially compromised hosting, suggesting an attempt to distribute further malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://agendaalzheimer.org/files/galeria/files/7424492274.pdf In PDF document text
    • http://kassa.pl/userfiles/file/97890148888.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/zorepobesokule.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af77e7430f7---36192167126.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/pekigobek.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kasekuxojoda.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/sitavub.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/0i8e96ver237f373jgjo5khqf0/22757048536.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/vonatetixibaworekutelobiv.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16079d91622689---mesuregu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d06ed04a911---jufad.pdfIn PDF document text
    • http://fitviewer.biz/files/file/90016467636.pdfIn PDF document text
    • http://espokebar.com/uploads/files/mujutidujafojefe.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/de0640ccbb989090584b18dbe7ce78ea/bifig.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/jk20e1nu8c15ga130iop7mse3s/wugekagonumimamodupid.pdfIn PDF document text
    • https://petek.biz/resimler/files/339095552.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210803/file/levisok.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7827e9bc95---97052303277.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/feb33290a155caa155e7c917010e0f81/81939199082.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/raxatixiladewojubufevifa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6e33530d4c72301cceacbb93c3c3f26f/28658988122.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92283e86c---jipigedexowawenemewaf.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0a08170c7---wobuzuki.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090efc84789a---zisigo.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/4759575266.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/89810112443.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/gerejudoxulixepekej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=notes+on+digestive+system+of+human+body+pdfPDF 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_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 16880 bytes
SHA-256: b629fc5c9577526e4ab66e2fd96e2e8c1feabe1830b5ed3f4b2f07a7d7b68c0c
font_01_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 11196 bytes
SHA-256: c55e4fb4965b133aacb85e89c4171b16c83983a5eee47fa30ed98a526b39b0c9

Open this report in the interactive analyzer, or submit your own file for analysis.