Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ce13fd5669865c…

MALICIOUS

PDF

72.3 KB Created: 2021-10-04 04:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ed93618270bf5278d82fd938cc89b32 SHA-1: 169b96c6a8defc5c4f3403c5706a4679bac31b75 SHA-256: 03ce13fd5669865c0f6e881b36bb1720dc176149cea3f507f9c6b68c6dc1707e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=cheapest+first+class+flight+in+the+world PDF link annotation
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/tivelevesigawaxutubov.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c740596a4380fdec319dc3b477dc5633/1792183493.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/72652062914.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/29047194770.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371beaf14a6---xanogopuxodofitazij.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/15426398247.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/jidejodimibituto.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/lupafi.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/wasajeruxumuvuvim.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/98114275492.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/38007183958.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/sakagofuf.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/77521527556.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/xeranosawodozosum.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/80967681171.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/23799260366.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615159a00e49b---33535507800.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210905192503.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/kedokateromerixaji.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109110703596703.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/78621766396.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/89657863236.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/korudo.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/valanufav.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_off0000b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB466 17628 bytes
SHA-256: e4f9ea48d5952ccd68ba26f62cbd0ef14d2c70b0f709083f0925a56dd32e73ed
font_01_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 11016 bytes
SHA-256: eaa01b9419ece7d40d900fe1b21548f92742ba049434834127af4e96390f9308
font_02_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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