Malicious PDF — malware analysis report

Static analysis result for SHA-256 7290c3193b6c1402…

MALICIOUS

PDF

84.3 KB Created: 2021-08-19 06:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1aa6cddfa368f66edf731ca023553e51 SHA-1: 57ee2150c31131813145c88eb0828b2ac79f4a7b SHA-256: 7290c3193b6c14021a2039b4ff7680186021e0faf16e16cde6af147f8627fbd7
164 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/0q6nt10dl9730r8cnttkuvvd85/14576556988.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b829b139006---65143853723.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607747f663ad7---kumazexigowulonitij.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e5e056d6---25235310303.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a31041bdf0a6427ae0e9bf18f9ad8e9b/54284741674.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/85136280364.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/wefivedajaru.pdfIn PDF document text
    • https://tisuputih.com/contents//files/motopeliwovop.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead434eccb---42790596120.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/xubewisazesuw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lekusixigowipi.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/fokuzirozepuluzuxoriw.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b10ee3e1e26e4e2000930fc996fb8594/ledobugajapimurakepugu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d1a52cfd---6877456662.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/lepileferawe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5d8a1d0c4afdd6eb88da8f8f803c347a/9005023441.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/vedabozabuwife.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/dinosazamogujojaf.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609170b16bb4e---2223918312.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/afk4c5c3pbph68t608n7ket5q4/54104468528.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/dojikozukutadafeloxo.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/61651425535.pdfIn PDF document text
    • https://nevisnews.com/userfiles/niwofulo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/26129248937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+5+apk+obb+download+android+1PDF 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_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 16892 bytes
SHA-256: b1629258e041cf4a3286a9cc7ae02969ce1b39a012ddaa0ff3d2b0500c8b4371
font_01_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001284a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284A 10628 bytes
SHA-256: d49c4ef145f51a405b41342882fb60f7ce049b47a042c09b417cab97c9148a24