Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e69bf69160ff5bf…

MALICIOUS

PDF

105.5 KB Created: 2021-08-20 23:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c3a5a3a2ba677f0d9b7226cfe6a23e88 SHA-1: fe3ac913c44e7c4351988d18f4cfb0c5203625e6 SHA-256: 9e69bf69160ff5bfeb7a84775f9fd2e6b599e33304bb085b48b47834c10b6ec3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The PDF document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://sartoriaventurini.com/userfiles/files/rufepitimem.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6e41b7e4e7ad0f7f029571df1dd9c6e2/nonomatazojavogo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ff345be22d72d3cef019cf7f2f99bf67/64042439246.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/c14m6j0b0g781hjj0ep1d58eo3/xasuperujaguvatura.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ba69e3b8d7c488d1790eccd61bf59a47/bamawixavejusa.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021071304451681.pdfIn PDF document text
    • http://wp-kancelaria.com/userfiles/file/relogiw.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/nazodadiwakonop.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/2901650856.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c36917eca0d---kapexiwalozaniketosasujog.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/ruvare.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j306p61o585ifnlfd4it58gsel/tiviwasulomebotitavud.pdfIn PDF document text
    • http://apelasyon.com/img/userfiles/files/sunif.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/34217915916.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/20966243721.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/vc4sqtkccd34leadbc0am01i7r/bawekipetoripoguxopezoko.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607956a836aa1---87516734392.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094babb66ead---feregovem.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/fuwiwatopiguxif.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092c5b8ded30---6964611483.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f82fa5af35e---91618701906.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/takis.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e1215e2c8ee6a59c8a9050704b8aa403/vazufirisosebafomu.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/roxivofawiwajesezuxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=que+es+primeros+auxilios+conceptoPDF 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_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 19384 bytes
SHA-256: 9fbb801f1c04b62de56e42ebecc3b2d6af8e93afe65a6813d6e235c872e8c3a3
font_01_sfnt_off000164ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D16 10796 bytes
SHA-256: 68347f4aa6b0e2d4e501e0338aa7a30578d34a7f492f33e270d1381a7d481fbf

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