Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83283d1523609a5…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 04:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d76c669d2034c567a330d5c23f52bae3 SHA-1: 823fd96783dcce58482b5fcd4b4721eb2e56c357 SHA-256: e83283d1523609a5df7791052a5b2cdf33e64af8791eb7395e9b86358980b25b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a collection of links, likely to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/uplcv?utm_term=parasitology+paniker+pdf PDF link annotation
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/1648853158.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160907c29a575f---60382291667.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/kovisodosozozox.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/jomiligox.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/97143013546.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/vuxiwe.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/7836601662.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/xitegurujegik.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/k05uejssirv098j1blej0gn1p9/55513033328.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b7b8f1508750f40c08adb3ad296b155a/weninot.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/42549910357.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210810192111.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/sanuvugu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/hcubkv19t389vumgaoojr1evlc/fepuronelebowugakasumet.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/noxipivufanetexa.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e75735da69---10674950924.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/84044525659.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/99719302813.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210721_151419_168.pdfIn PDF document text
    • https://esvigo.com/upload/files/padinapokipodevugunanopid.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/kodus.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/35836799223.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a121a1327106e263e19e6968db8f352b/zuwudetarixugajotinisa.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://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_off0000c28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28E 17084 bytes
SHA-256: 31d00666a8ff63d4d8214d36ae2f5d70f5998ce3f4ae0d8f0080408d4f4493b8
font_01_sfnt_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 10880 bytes
SHA-256: cca22a057595105fc3a8aa41bf7b434bef95ec6737fb238e448453675e6d9754
font_02_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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