Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9ec80c8c4b9409…

MALICIOUS

PDF

100.6 KB Created: 2021-09-11 03:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15b20ad438b23f6c18a2c0701e3a4dc9 SHA-1: 3947015fed657d114d7cd807887516b90752830f SHA-256: 9f9ec80c8c4b94096a563c1053ea722612cc9b11e03a3baa55b475b78de6225a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://oancora.com/ckfinder/files/vofofipe.pdf In PDF document text
    • https://wegofa.com/userfiles/file/fabodunekukasulepivolu.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/22213643326.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/m3l0vi44fcdnfqbppfio8ehk5v/76564303192.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7b8e415c---51852139526.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/50597592872.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/35526461568.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9ef19e59---97447402481.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/44159863911.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/wetorevopekefakogas.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/30338703049.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/miwipivivadavitov.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/lezab.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/vinasunozijuzakuk.pdfIn PDF document text
    • https://petala.gr/userfiles/file/kagisipugonetoku.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/53640271137.pdfIn PDF document text
    • https://bawauang.com/contents/files/fituvuboruvudalaj.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/91453570285.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/3378755727.pdfIn PDF document text
    • https://stotex.rs/files/mesumu.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/16411937684.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/lukovutemovapujoxumivozeb.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/pepezalilibojaxiwefetu.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/74827719338.pdfIn PDF document text
    • http://cutskytools.com/d/files/zitapikepavorip.pdfIn PDF document text
    • http://geodez.com/pliki/file/rajijinoxobog.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/27018426941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=list+of+celtic+deitiesPDF 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_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 20412 bytes
SHA-256: 1f24d715b61e20f7755a2d2f335e6f3cbb532b8c626c664e258362176dc1ecf3
font_01_sfnt_off000155a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DBB 10060 bytes
SHA-256: ef71e00935f0a74fcda49706f4ec357736b42b5eb1a71722369658427497e35f

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