Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e630a44a1fe7b2…

MALICIOUS

PDF

68.8 KB Created: 2021-09-08 09:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91444c5d98c091a0ba86ed5a0ce12424 SHA-1: af571cbcf8a4ab75f3c5a501163280ccf3810254 SHA-256: b3e630a44a1fe7b2a263e5e2a2e05ca74bfa0becb9c3a8bd9f510f08d5d9993b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially untrusted hosting suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drafthe.ru/uplcv?utm_term=dpsa+internships+2018+pdf PDF link annotation
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/60878137479.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/60462963699.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/dufanobenoj.pdfIn PDF document text
    • http://wjcopy.com/upload/files/2410999300.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119c40bcaf4d---domujarexufesadene.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d341gmsu4inc5jvfs64b29qcf1/24783247264.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/41187665407.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/44054688059.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/50938437352.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/9d152391552a3ea57bb084acc033417c/20609484883.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/t1er8hlr728hr72otg26i6uk4j/51786815707.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/3204219478.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/furepukupat.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/geh4po1a9pdpcslr9q9feeo6r5/44256179527.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/84754965118.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/kalologiwawuwu.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/faxifa.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/44941748351.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/38224541616.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/xewera.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/bv714gp43kdnjk076u0kaotr5m/zajajugabiweke.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072155054f0d---xegexezutogeb.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_off0000b148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB148 10932 bytes
SHA-256: 415a448e90e789dfb5c21a50509047fe2960ceb6f280bc1756dba97763ee0d7f
font_01_sfnt_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 14180 bytes
SHA-256: f63ad93cf2c35bb110e1d4a0dc33a7dbcb901ed0562eca20ccdba0202d64d9cf
font_02_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1