Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba488a8abd2c03a…

MALICIOUS

PDF

81.0 KB Created: 2021-08-11 17:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b978d9c954b0fe8acdae999f601393d3 SHA-1: d463b6c4150af0e4850cdad140598d25cf63551c SHA-256: 8ba488a8abd2c03a12e33f798f19ee9af5ca22d98d81e3a06b16910ca2e3e504
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/d3fc3jgu63o54jutscpgml38tk/39403101469.pdf In PDF document text
    • http://saxonrt.hu/img/userfiles/files/zutelolujisisiladewu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608191b3a7585---97487502963.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3cfc05478---fejevekogezopawosimame.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/12840610914.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5co2ifcdbkg3ldrq79ggfnuki3/zalesijije.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f895ac2bfe1---dagonuweru.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/gotesukosavivuwazi.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/18196997314.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/3103713721.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/42810522304.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/27087902424.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u9ga7049p7a7dqrf53niv0td61/fulosemofomano.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/rokafakamogekagedixuzum.pdfIn PDF document text
    • http://omg.su/upload/File/sisipaxiguzinagifavisugos.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/ridamederaxemejuf.pdfIn PDF document text
    • http://519pf.com/userfiles/files/pibititogagoxat.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/67961961684.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bb04ae58e05dd8170b653bb6c7be6568/karejerokevifejibepogex.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/motixivufowunozasul.pdfIn PDF document text
    • https://partnermind.cz/images/files/74129224494.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc0a5789f---10077805918.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833116c49e---84330637303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kumon+math+level+l+answer+bookPDF 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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 16520 bytes
SHA-256: 31bbc9d3c032640a32e8b36f98adb96d0519186f0a8d9eb96100de668abfcb6b
font_01_sfnt_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 10756 bytes
SHA-256: 6f9fb0a561369c71477a2c3696faff16becdc6c0fede32a58efc2b2b26a06bf6
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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