Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cbe43ce520f461…

MALICIOUS

PDF

83.9 KB Created: 2021-09-14 10:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5afcfed5d9ed8d903f0902c611fef0d8 SHA-1: ec331afc994151279b9da98f1829f83a72e7cf78 SHA-256: 79cbe43ce520f4616dbe2d8dc099cc5be9e6843d81598d5a7385dc82bdde9dbe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack, instructing the user to execute a command, likely to download a second-stage payload. The document contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://huntic.ru/uplcv?utm_term=shortcut+run+game+free PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/50ebf5b693c04305b9392a285f24ecd3/dejonupavozajafaroz.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/meluragedaf.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/10132284315.pdfIn PDF document text
    • https://suruburi.net/mm/file/71043671257.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/87249487179.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613651ad92f14---71729391646.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/moginozofitija.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210908201645_2088669676.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/7016285896.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613033e6edda8---jojigoxorojijorivogajex.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/52721533768.pdfIn PDF document text
    • http://kezheng.net/Upload/file/defokavarawixinigijikere.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/97988200497.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/119477af2eb00e1d022fbaed1c743ed4/55817006475.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/sixupevudexosijupinaza.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/40118422588.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/37454996031.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/23568281336.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/mubopifaxo.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/20714126030.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/gifudalokepexovuzobojis.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/73651645932.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/67379097390.pdfIn PDF document text
    • https://mauspro.net/upload/files/23403723524.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_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 10652 bytes
SHA-256: 4ba7ca883149c19c76909b770a2d81dfff88fb2d673eeffd6247a0aec5321b74
font_01_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 18252 bytes
SHA-256: 277260bf966eb0c3d6380acf5efe7fade5b680941d0e7c9d95f511e782a156bf

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