Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91aa3295fdc9f1e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-20 08:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c40f9274731c025a170b456dcc2c1fb SHA-1: d75ba3b91a5c4fce7c5d830bf632738bfd5ee75c SHA-256: d91aa3295fdc9f1ecd6bd8224565fb8cfd0fd271cf285538e6e4c3e15750d66e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dalnoboy.net/data/filestorage/upload/files/73311726975.pdf In PDF document text
    • https://bongkartuantakur.com/contents/files/45586169105.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/povosuvozadurusorulubot.pdfIn PDF document text
    • https://dyaa.club/uploads/file/99234442821.pdfIn PDF document text
    • https://mihalex.by/files/files/34697662022.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/pemusijitesazixe.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109011051043052.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/xinigadok.pdfIn PDF document text
    • http://showdoimovel.com/files/files/pilovolo.pdfIn PDF document text
    • https://subded.org/userfiles/file/rexogujekuvukujetaji.pdfIn PDF document text
    • https://ccskin.com/geektic/files/fedevapufukudefuwobime.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141ff4288d8f---25458642803.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/23970361173.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/48364559202.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139c7a6f0733---82953404801.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/3186993330.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/xuvikivup.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/42830348300.pdfIn PDF document text
    • https://2acontractor.it/images/file/mapesifuzil.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/76880617821.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/rikapoxulakonejefivu.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/mefovaj.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/mimoxofabuxizitibo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k777mp1307sa5qlsq21v8ek90s/junejefe.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ff434fac---penakana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ios+call+screen+for+androidPDF 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_off0000b95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 10324 bytes
SHA-256: d4e32dbaa676954fa790ca470e622671a1fcdd11411d42b601c80f9f8f6523c9
font_01_sfnt_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 16152 bytes
SHA-256: 79bce3a6e0abc27dc4f7dba9ab5faf942c8ee1fa20d03fa75bff129ea731edc7
font_02_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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