Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11140938c34f6a2…

MALICIOUS

PDF

105.9 KB Created: 2021-09-07 13:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aef60d4e88bfcd6bbb97397f13cead0d SHA-1: a022ba7b484c3a3f3b5cbc04639f11eaa781d5d4 SHA-256: d11140938c34f6a257031bf0f72e139fe9a5cc2d24852deeef10160f88b57fc2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs hosted on compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://innovad-ltd.com/userfiles/file/48510019565.pdf In PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/sexulogezibe.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/58910475726.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/zuwenetegizab.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210616103446.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160906b99377d5---79144157543.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5a4e0830ed0f226ded8d84c493c12eb4/12171929278.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/dd295dab6b175d960b07d34d1aa6e896/27055076265.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1610099e323c26---vikafikolakinimek.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2682bd77---32369722496.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/55554423441.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/vopepigolupimaropi.pdfIn PDF document text
    • http://vodova51-53.cz/files/tewakipejow.pdfIn PDF document text
    • http://babamoleskine.com/files/file/44380928501.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e817382768---56471738850.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/171451899.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/70353154321.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/21016334613.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/94929224086.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836d2bbef51---92678494397.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/25/koditarubetafus.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f55993ea1---tetafekutepowezaxod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=manual+testing+contract+jobs+near+mePDF 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_off000136f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F6 10936 bytes
SHA-256: 7cabe370c74e17400556e0023ff57da4604e5730c345a823d5312ce2f3503994
font_01_sfnt_off00015047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16859 18884 bytes
SHA-256: f28450140f1ea18844695ddefcabf50ab678595e7841363a796bbf943531d73e

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