Malicious PDF — malware analysis report

Static analysis result for SHA-256 089c629024659a70…

MALICIOUS

PDF

62.3 KB Created: 2021-09-19 14:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31c818856b7450586342e49d7edc9041 SHA-1: b7a21ef4dea19c158b40767516196df0958a9aeb SHA-256: 089c629024659a700b80cc6cb08a957c119a8e09b40072728e27f2e040b8fdff
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, pointing to multiple compromised or disposable domains, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7557

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 http://polymer-optix.de/userfiles/file/nosefumofamefur.pdf
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/romujavupajavadiwane.pdf
    • http://royalleasingny.com/admin/images/file/razoxiwiripusivar.pdf
    • http://szyqjsj.com/UploadFile/file/20210904033631871.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/47694801138.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358139bc11d---38097953909.pdf
    • http://graciaindoutama.com/kingkong/userfiles/files/folefiwobogemupadu.pdf
    • http://klubalfa.org/img/userfiles/file/batitikowosami.pdf
    • https://northcoteplaza.com/userfiles/file/76090820079.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/ziloforatonorowimojimamu.pdf
    • http://pttaccounting.com/userfiles/files/majofapi.pdf
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/kixokajobisoxezazowomil.pdf
    • http://dongshengcable.com/images/upload/File/pagikotebovem.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16132ff89f05ca---9927143111.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381cf006f0d---disuliwefelup.pdf
    • http://ps-chiptuning.hu/userfiles/files/rategivewanas.pdf
    • https://kasihpaham.com/contents/files/73807398154.pdf
    • https://rkdestate.com/userfiles/file/27827476083.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/76393ddbdc67624c02848a556d8869d1/4436338613.pdf
    • http://centralgiving.com/media/userfiles/file/46056235373.pdf
    • https://iwanbim.com/userfiles/files/31202344566.pdf
    • http://indexone.ru/upload/file/41712443116.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=where+can+i+watch+the+killing
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3a.bin
4638ea9cb3c56b5c7e1728a5064ca0ae1ee20d981cf394ad760e398baa902f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 10392 bytes

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