Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84c098c94926249…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 03:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 355c93f477f042a2555ae33f78cb7d71 SHA-1: c0eeb84bd48b8da8cec8db253624e9244a51d7fd SHA-256: e84c098c949262495b3402525800aab7e0ba4cc93428064a023282220c03720d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF 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 upload storage and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/l0ntto5bc3rc60jcrehrf5i94n/sonovikije.pdf In PDF document text
    • https://itexpertdog.com/upload/files/vafaduzuludewuwan.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/58314711981.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/moripatedoposiravitixef.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/91043769573.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/raxusexuxedidekifafezi.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/bibolidumejaratexugaxidul.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5gefchcfmqht0nmg2g31obav60/mejemebifilurivuzipu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11e09d02f---nemonasuxupifizi.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/kejuz.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6pdgps2ncv7cjog2s78bqi2e25/48082746921.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c95e4912cfb98c2ba3c1d594e7817c32/99492011652.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202108230709495080.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609c31a227403---70960185282.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/duzifabax.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/vupixikudaxuraguzoke.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130121ae924a---nuzizigilomitajaxojitusa.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210826070056576.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5a2a50cc7b517bbc61ef78237742b070/bidaw.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/9942d6ef3e8ad16114c3ea8abe6ba18d/83753836848.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6556ee7c3df1d4775d7343c0033f6bcd/xevugu.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/toxokitogefapidesinasusi.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/jujuzesuwidapulogol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sonic+and+tails+vs+knucklesPDF 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_off0000c21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21A 10596 bytes
SHA-256: 636aa0f0c997433d80c14e2cbde3d279161dd8051079032201e9ab8442ad3b8c
font_01_sfnt_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 16772 bytes
SHA-256: 2e9d3967c531dda4381d9f49e29ee9ad2d1e320cb6bbc5ef83434f54e230364f
font_02_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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