Malicious PDF — malware analysis report

Static analysis result for SHA-256 5427f123cb846b9d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 19:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0df2b9665f51fac541c1f722f8788c20 SHA-1: 579dcd4ff10d209574750d368d5a4c3bb637ed78 SHA-256: 5427f123cb846b9d9712c3666547df46affba697befb57091a9c4a251ad9cf5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hoangnamjsc.com/upload/files/50292709797.pdf In PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/15828776788.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/73752523194.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/86419778653.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/zexulopuze.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391663396e6---24158856144.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/39016523266.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a3eeeca5c---52313829804.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/89578835521.pdfIn PDF document text
    • https://cardolf.ro/files/45611823228.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/mexaxivisapuzat.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f0430c4df---93603676807.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/4393516917.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/73220389497.pdfIn PDF document text
    • http://unsersohn.com/images/file/35473293167.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/31871715419.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/61962297681.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210904_22318E0AA29C74FA.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/40487484324.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/78505764704.pdfIn PDF document text
    • http://zeci.nl/im/image/jutuveru.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/natagimeb.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/55940753621.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/25789397435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=image+to+hex+converter+onlinePDF 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_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 18308 bytes
SHA-256: 820fe9fe9e4e099177b5dd286ae44c40865f7ac0231044f6751efab6ad4807d2
font_01_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 10628 bytes
SHA-256: 9655ae53efd36fc0fc61549da572a93beb1ec475a8a14917d1b26b3cd1b4f2aa
font_02_sfnt_off0001274d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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