Malicious PDF — malware analysis report

Static analysis result for SHA-256 99facfa555a462ac…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 22:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73229a9b1c9b533a0ea654025ce7cf44 SHA-1: 889f072f815d07dda22c1e607f26fe9167f2d272 SHA-256: 99facfa555a462ace70584ac50e6d347dca0a30490932d4c6e62268bd22c2e4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded content are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://csc0851.com/userfiles/file/20210626095312_iv3fre.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/slr4vt0god2m1rb0u1bfuo7oia/84861281671.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/69646578510.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609532007c49c---62761498498.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/23682173162.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16114eef3044c9---54549382105.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/1af5b24a28908fdd2bc872deec50d9e3/55739741022.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/3376772433.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea5addec13---9907326121.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/dikewabanudoditanuxigelil.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6b18f096---60241316327.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075154777797---90007018741.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/33088626109.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/dalafobuguwedub.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9cb92c41335083e9207ce28c292e05bb/89341108037.pdfIn PDF document text
    • https://faceless.me/userfiles/files/gobiludod.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/46270848327.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb9a0538e463a896a6627911634efdda/75286188092.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/senoda.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75f514a75---xujagezanofadesal.pdfIn PDF document text
    • http://nakatka.com/files/file/94123230105.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/nuzineditejabanagugovudak.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/laberuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ortopedia+y+traumatolog%C3%ADa+revisi%C3%B3n+sistem%C3%A1tica+miller+5a+edici%C3%B3n+pdfPDF 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_off0000b905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB905 17728 bytes
SHA-256: 748f475e36f1eaf3f4c6095c51189191f2e96517d631059efa26e60421809ac4
font_01_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 11780 bytes
SHA-256: 3b0a242e31b825913b032e2daea4d7703af9cfc0cbb9ff58b64bdf2675109a53

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