Malicious PDF — malware analysis report

Static analysis result for SHA-256 3921fef7dc4bca8f…

MALICIOUS

PDF

175.7 KB Created: 2021-07-05 12:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2f4cbd7ea6b17c695111a2eb8b639ffc SHA-1: 6ba11037e076e649e18636db86033e417e7d2f66 SHA-256: 3921fef7dc4bca8fdee513e721a5ba97e7c3c06e2be9464e08bbabd4dfe26961
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting it's designed to redirect users to malicious sites. The file's structure and the presence of many external links indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9415

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 https://allytemp.ru/uplcv?utm_term=microhenry+to+millihenry PDF link annotation
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/33252629026.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2fa6c634a34b3ce81bb71b507049f38c/51682903063.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de611dbce69---11049945937.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/dizidubexenogukesojiv.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/67298161509.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/suranelolixegifa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/45344034501.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/wuvelilajowoweluruba.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160890fb3ea6ef---32479594195.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e1afd4e10---juxifem.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/07d6163e07df97b73fc60cc9c8adcf85/bitoxavewofunozugusuw.pdfIn PDF document text
    • http://tatennis.ca/clients/29257/File/30306912724.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/74749784002.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf163e0545---95881428194.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb24721c86a---19020219039.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/18135225134.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uukqg0n00lv28efla4nlcf05d6/66533111093.pdfIn PDF document text
    • http://licausi.it/userfiles/files/52849845822.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/28513762949.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/63335430064.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/musifebuzapibajifupumiz.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160715d358059b---46193574166.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/19343500016.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/tokepigivajujarowowafikeb.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BB3 1696 bytes
SHA-256: 266b75d8d95edd4e06796966e43e1bb0a7116b249193fb313f1988fa9bd38e89
font_01_sfnt_off000233c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x233C3 16748 bytes
SHA-256: 3689bdb0943a7a37c63cad6618cdd46166ba9e3a1b02699e017d43f76fd6fc4d
font_02_sfnt_off00024ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AB2 20740 bytes
SHA-256: 146906a15f8084f3023b54c4f113427adae47dd5f5a9e11694d3d6ca01c3ad80
font_03_sfnt_off0002816c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2816C 10272 bytes
SHA-256: 7261c7b86fac7338a54268991e423057c2580105702e7d60eae278327ff9ba57
font_04_sfnt_off00029851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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