Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9f350fd04b7f9b…

MALICIOUS

PDF

94.6 KB Created: 2021-06-25 16:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9408b5395539618f8341bcaffe7cc6f7 SHA-1: f45bdc556d4310f87dd733cfd355fb120b055b15 SHA-256: 5a9f350fd04b7f9b33630f50b405781bf4125cfa726503d5fa7360aa2da45514
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting domains. This structure strongly suggests a link farm designed to lure victims to malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=exponential+distribution+skewness
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a7cb59397---mobase.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78378c463d---siremusakale.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a5b4052c2---rumiwirorevurod.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/fka0i4qohchspr9l4a74k2jp65/xaduvegomu.pdf
    • http://szzxwx.com/Upload/Upload/file/20216161034238137.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c17b0c0fd04e86839ead6f85c65515a6/8705171706.pdf
    • https://alnahamgroup.com/userfiles/file/gusula.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a56e5a3d1---27537984072.pdf
    • https://stillwaiting.org/userfiles/file/69800704097.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b28abc4c7---29320826941.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7246486563---sadujakujuzubilujuxu.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/qedkqnsaojr8799mtd5o1vg5m0/79644839823.pdf
    • https://samarpanbharat.org/trila/userfiles/file/wekax.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/manozipewamejogero.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9680e75319---forujudameli.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c10.bin
3d94ff7a9af84cb11d6fc740a21c19155bdb8da532de60a52b4ee4bf913efa2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 18604 bytes
font_01_sfnt_off00013cd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD4 16792 bytes
font_02_sfnt_off000154eb.bin
5730b3aeae2ac64926ef74c89f2b7177bf00d7cb75abba3923eac973174e48c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154EB 10888 bytes

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