Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd0cfea8fcf5c3d…

MALICIOUS

PDF

78.0 KB Created: 2021-07-30 17:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8cf75a283972922cec0c3afce95d2520 SHA-1: 11beac6753f755b519f7ad891b7c9deb5a59a686 SHA-256: 6fd0cfea8fcf5c3d60905357fd559691524a39ff80438447b10ea76953fb3b85
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to host or redirect to malicious content. The embedded JavaScript stream, while not fully analyzed for specific actions, is a common component in malicious PDFs for executing further payloads or obfuscating malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7464

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.
  • 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
  • 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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6807aea5c---84565708893.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160819fae40f10---melegukosugasatomope.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/siworavuduvupobuwevudun.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/45035217355.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/ritovodagepakuwu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c76om7utgs1qd5nn5bs6f2rgj3/94494815773.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/zinabexomemax.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/29562623840.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e894ea6be886da6a48f7accf37ebd5d7/24864103783.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8381e9e14f---11198669235.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/satikapojagemiwutinela.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/eg2e1np4rugol1nt95rmdq91r0/7397515066.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1625595981_5782b738e6.pdfIn PDF document text
    • http://indemo.pl/Image/files/2258571983.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cec87041fb2---pavajajiv.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210724_CBAC06DCEF599579.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210609_B499A41F97B4DCF2.pdfIn PDF document text
    • http://jaatkinson.com/userimages/64163214718.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/jbs0pfkp95he9f8fso3kc19bpc/debexotevijok.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/e95ottfm7gjfticceqq3veceup/rigeb.pdfIn PDF document text
    • https://bem-sa.com/img/file/sanotabukaloxade.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/77797055495.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/4450218049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=horizontal+scroll+website+template+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 11060 bytes
SHA-256: 44c6ed81058eb7a1c60e89c06de81b1c65dd35e936a890ce38c0bd31d548f1f1