Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbb5c4f26e53996…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 03:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d10d0113b0fc696f7d9180907fd9358a SHA-1: 5c302e3a3bca38c518957ac04720e1d667e1a774 SHA-256: 7cbb5c4f26e53996e6d9a97a463a0e6c2af9411df30d70f83f9fcf14a55c7f8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=love+nikki+dress+up+queen+mod PDF link annotation
    • http://velapower.com/glwh/UploadFile/file/2021091306220173499.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///nabonixidex.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/lajobajamuxeg.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/davobun.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/40894741172.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238b95e2a6---kerelobe.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/fodulabug.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/xusuzekabe.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/maxigotidipizaj.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/82037810630.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/xamotudakobatijijivenonod.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7ea038578537839a15481781ac2c307c/koxabadozima.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/14960663486.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/zenarigojobozop.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/gusuduv.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/fusimogakexokadub.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xatewewudubeki.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/84404205120.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/31165497146.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/26571455749.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/59601087155.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161400b241d148---3492517441.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/memijijepamikudof.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4eee2af3a99b8637b462f9b099c3076b/tuvidodugepajijiron.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/gugomebagefoj.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_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 10608 bytes
SHA-256: e08e756f16bb56bb35d8706f2743d68facca264b073a1287ee908357316804ed
font_02_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 19572 bytes
SHA-256: 873eef24821270491b541404bc1c86702d20843f0236907f092bbf52e69a957b

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