Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58e7d76c03ecca1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 00:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a741fa63a61d634c0d1b53511629ce87 SHA-1: d372f55cee175e6aa1c90403b297a61f9e3d5dfd SHA-256: a58e7d76c03ecca109d60722539d3a9a350349bfe9427a05fb938406a5d9e416
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV and an ML classifier flagged this file as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to lead users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://immsac.pe/sgi_userfiles/userfiles/files/38598540177.pdf In PDF document text
    • http://zjhywt.com/images/upload/File/96817357593.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613d91c43a402---34445343015.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/78762352888.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/52180456368.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/molezitonomanesukaxa.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/70188088989.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210902_023C3118E367D7E5.pdfIn PDF document text
    • http://bndweb.nl/upload/files/jevot.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/dapidolirodemuvutavumimi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a594f0bff5bcf55ef99bdd3d9233f952/kexakugusewatajapa.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/94075026626.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109011926418147.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/fajovokugugugazap.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/tumadiralolivutufalixoliw.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/tobilebuxiworutaviledo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9415a87b8918bc646ca12632e0569674/suwak.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/zoxuvifugujuvutadajen.pdfIn PDF document text
    • http://3sdent.com/upload/files/fusesurasuriw.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/zakobe.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/87287397385.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8d409cac41a85f4410efcdd331b42627/retelaxa.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/63748146125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=netflix+gift+card+codes+freePDF 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_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 17792 bytes
SHA-256: b5977bfa16943d46d8fecb04f0f8cf010a166d88827fb594c6acb6f21db04548
font_02_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 10628 bytes
SHA-256: a9be7a13970a7b6046b0fa18b43afc05f234fc96bc1d5044f6a13f6d80b4aed1

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