Malicious PDF — malware analysis report

Static analysis result for SHA-256 915669c673f08abd…

MALICIOUS

PDF

91.4 KB Created: 2021-07-16 13:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 120535712269a7ea67b6386657cd4527 SHA-1: 722242aac5f2daa81dcd4cd7098a68930f81e607 SHA-256: 915669c673f08abd38e43bb9a91a3826baa7efbf03637a6d75b290632caa38b9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://irlanc.ru/uplcv?utm_term=haircut+short+on+one+side+long+on+the+other PDF link annotation
    • https://bistakalikotenetwork.com/userfiles/file/penajedepa.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/sepumuz.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8d8776d2a2bb2ac7b5b89e3db9062512/71730030648.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/63171359288.pdfIn PDF document text
    • https://aashianarealty.com/file/mezidarogabezakira.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64a320322a---lotovera.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/wixevutatarenupogabikode.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d1e2738dcbdbcfbad7443f7db767a726/jegukexamezugurivemitoxe.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/16dc0pqd88dki2hfu39vr8p5i6/63017750205.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/jixubodewejoj.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/konenidirar.pdfIn PDF document text
    • https://triosms.com/userfiles/file/nujenirito.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/nigijodivebozevovaneja.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/pukejenuzelifoza.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ca17b5b2---56623728198.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8daf7cc1e---sawufixijenozifomirifeziz.pdfIn PDF document text
    • http://industrialdevices.in/uploads/61594772393.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae317cadec6---85428659655.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a41a2481013---21362957753.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c954c2f28e9---wovadilifodufevage.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6d7949ced3e4ba0286953a76db84ccc9/8297568678.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/metodo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/92e1610fe44cef7eb395194fea315fce/5376922867.pdfIn PDF document text
    • https://12tiga.com/contents//files/repebifolipaw.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_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 18148 bytes
SHA-256: 7dd60405649e70f6cb95af548174c9b65adda4cca569ac91fcbb328f579dfbfc
font_01_sfnt_off00012fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D8 10740 bytes
SHA-256: 4ec99f555dcedb7c675cbb133b90f29b0f7743161e06236f75b5c180159b70d2

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