Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9aec248f6edfc1d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 12:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d10f3854b0a753c47e9f3054b424064c SHA-1: 260da3a353fbdfc2fd6ee7cb8a262a70f882cfea SHA-256: d9aec248f6edfc1dd718f58c8519ab789610e9277728ae7cffa7372868e4caef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to external PDF files hosted on a variety of domains, some of which are flagged as disposable or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. No scripts were extracted, but the structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://technocom.pl/editor/file/dowesim.pdf In PDF document text
    • http://oreade-breche.fr/userfiles/file/44831522346.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/95662793370.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/teledodabiwebodatidamoluj.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/banudiguzosuberowaxobi.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/bazapane.pdfIn PDF document text
    • https://hinaweb.com/upload/file/50823319540.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/kufewotefelimi.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/favikegojo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd083a0c7c---segivujidawipen.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/kirifuwuputoxuwupuviroxob.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/08/miwiniguxefosexowodud.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fc14b765---zimemibanejadawel.pdfIn PDF document text
    • http://huntland.hu/upload/file/vivodetufuvo.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/jamoxufajog.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/88953596377.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/kilufosubakuwopujukodin.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/magomivagotukuvimazede.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rakupamanalituxura.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/41365515750.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/tesotulovexijifudesemowub.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132ecf655de6---89112409157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=install+via+adbPDF 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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 17412 bytes
SHA-256: 1b9d25de5331a2e6eebba0e846bb465c81b6aca04327a1df0f24f65458d9728c
font_02_sfnt_off00012afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 10048 bytes
SHA-256: 58bc39b1616125be846bde632bd6dccbe6f00fbc796495fd90905af59fb9e8d9