Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d84bd1cd04db3e2…

MALICIOUS

PDF

87.4 KB Created: 2021-09-11 18:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3bc2b47a2310046dad56db068c74952 SHA-1: 34de177093ecc93b7705e61d7fd163b2f618291c SHA-256: 1d84bd1cd04db3e2c15b913ad8fea5a6395acf6a65647d4e2f4ebe4e24405981
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://guineaservicesproviders.com/gsp/files/kaxel.pdf In PDF document text
    • http://vlajkylevne.cz/UserFiles/File/17236296534.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613976f31ce42---pixosavoredawuwirifuxa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e890f1ee---50534481979.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/saxoleketetasa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7095a833a---62976517154.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/siguziwajumanidewew.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85264755483.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/lizoporepitagop.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/xuxeberoraneparidedef.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/vonujuzebatutexazeras.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/jamunaj.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/tixigesiripa.pdfIn PDF document text
    • https://nls.vn/upload/files/ketivubakosopuw.pdfIn PDF document text
    • http://agama-rc.com/upload/files/bivodesoboruvivozokaw.pdfIn PDF document text
    • http://yuha.be/_files/file/84664090467.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/puburenugiduru.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/kexawemawojak.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/fogefivabipugu.pdfIn PDF document text
    • http://metapolar.hu/tmp/3277002362.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c144c8d64b---remanas.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/zudinotapuvevajawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=speed+up+android+tabletPDF 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_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 10532 bytes
SHA-256: fba89c8ef91b680e94af6551716f0094e797a25805887cc98699e34a9f243cf9
font_01_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 18252 bytes
SHA-256: 027a82a4f1c32548c7bd8d91c9e1614fb404241a1818646e78522cd2f5ba61b2
font_02_sfnt_off00013884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1