Malicious PDF — malware analysis report

Static analysis result for SHA-256 2627f6b82488d20e…

MALICIOUS

PDF

93.9 KB Created: 2021-07-20 16:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9a0d3cc69f0707693a43e1fb53f2bb37 SHA-1: b2ed2d52153024f7b28b00f9328a6df10e4d3e3f SHA-256: 2627f6b82488d20ed979b5873ffc8a15aa3ae9a1afadda6fae903ea2c5979722
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://botosani.ro/img/uploads/file/toxubawaxusasavovoxonof.pdf In PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8rq9isssgrq4opdt9298r3b31g/75696145938.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f07d00ccd06---20243124426.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9c13aaea809b1adb574f0d06a6f4e755/27441210772.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/55559631429.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/luwerabibofejejibu.pdfIn PDF document text
    • http://ping-property.com/user_img/files/24724015597.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a85aa75d3e1---16252506376.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42e08bd1dd---mudodudelekivev.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/44cda5e13b5067790e0ec7ec714dbd09/jesabaposadi.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/xoxatilamagasifotumutinok.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/27357936077.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/kel37u74rv876ib5rf6q3skml1/94771038933.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/riwuzexunojupat.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfac55111d---53560120546.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f64190036eb5c884cea0803f1d713f14/bolokoka.pdfIn PDF document text
    • https://rosycaffe.com/file/polazugu.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/42676237508.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/24363218915.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/37821458c9d0152b515fe1f6b51e8957/rogolagasaruzatu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e2585e472---83745361239.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/nagadanonesevobor.pdfPDF link annotation
    • http://blpest.com/UserFiles/file/60751759380.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/puxezosot.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/seesmmiq4o4e8sdp7s1lvpqj1n/21462008794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=idioms+and+figures+of+speechPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014fbe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14FBE 17328 bytes
SHA-256: 7d018639be273f7be967839e2901966fe265c0294a266461589a214ce1b37e40
font_00_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001089c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 18064 bytes
SHA-256: 482270d34dcd69ebf4c660f27c5892ae325df3da2f3a6903ae18d893c2680d1e
font_02_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 10976 bytes
SHA-256: bc05625bad0daa6d26040a6dd4411c5baf8aefa3c1227b4ba65bdc81be59d43c

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