Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22836c3586cb34e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-11 03:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3ad02f73d24f73a9974e903a11a820e SHA-1: 3d65b1d3d6ff01918a466f9f614fe58fec0b9cdc SHA-256: e22836c3586cb34e334f43436183130d283cd4cc7eaec36c3d7fadc7e0f0d768
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • 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://www.firengo.com/userfiles/files/70876247417.pdf In PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/90461255886.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/wosak.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e98060d26acef3a127c5a9f34e7e4fb6/99966251758.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/pexipirukebawofofezola.pdfIn PDF document text
    • http://www.pvvc.cz/files/82110442211.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/40728334951.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/numafufuligo.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadavipajubobupixo.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/sawepobirixerad.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/63157328933.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/16c7a083a1b2479b325365483517d8ce/37804294952.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec14a40b7e---wezerasop.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef4b6238ca---42835092256.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/duzobij.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/nugikiruvoxe.pdfIn PDF document text
    • https://promise-land.com/upload/file/vovagewuvepenisafimar.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/pugojalewigebuni.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/42602551631.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a512dda17---2958972486.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/74459391048.pdfIn PDF document text
    • https://trainova.com/userfiles/file/kekimeped.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/54404918496.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/papifatiw.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/10309345442.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/81724948271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+tyrant+falls+in+love+episode+1PDF 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_off0000bd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 10788 bytes
SHA-256: 502744ea7427efdf6c8db86ecf3ceec00a4a767ba2289e031ae2bd48cf87e40d
font_02_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 18328 bytes
SHA-256: 51d700f47408b33e111cb89064a3a6810c50b6b3b20082df8e61efbedef9e95b

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