Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7921b359fd55803…

MALICIOUS

PDF

83.0 KB Created: 2021-10-06 09:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 937cd6bed9ac59d3ac022322898ef0de SHA-1: 15bb0febe783a69850ec3ffeebd41994b67070bf SHA-256: c7921b359fd55803a7708cf81c71c4314ee15b0455472ac8dc03533867448b43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

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.
  • 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://apaman.ti-am.jp/js/ckfinder/userfiles/files/wurimawezuni.pdf In PDF document text
    • https://dennismaloney.ca/upload/editor/file/lezalazibikojezake.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/10121336116.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/90506695685.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/tedazuxakazomujixisone.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210919210317259469i587g.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a95e5f882161632518df284ff8fbca26/gidijezatitogepujelusewa.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/7177751484.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/58296522273.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16130c43a9f97c---80023716340.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/296e9dcced9f07cd47adf86a675cd251/77339815991.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae727e5a1b---riwadapirozaxovo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161410dfa09428---94990589101.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/vufusapamodin.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/fisojoj.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/15086052143.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8fb75dd5a---80981309983.pdfIn PDF document text
    • http://techmechengineers.com/uploads/32758547779.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/zekimifefuronuxigexoxal.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/wumid.pdfIn PDF document text
    • https://hse.tw/upload/file/rimimibekoxawenaweju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=jetblue+emotional+support+animalPDF 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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 18540 bytes
SHA-256: 16c1e3c48916e70847cdbe698b7bbe919f6a396340fa2af98a379cce699eb9da
font_01_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 10644 bytes
SHA-256: 15159faa1b4de995143b74b43c1d377ca16cc1e28193746a78c73883c614e1b1
font_02_sfnt_off00012663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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