Malicious PDF — malware analysis report

Static analysis result for SHA-256 6327333ff15d2f9c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 09:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c9a0ddbda170b4c3383538b253038a5 SHA-1: c51f523317fe78e1f1dcd4bb9e83a6ee5f64af91 SHA-256: 6327333ff15d2f9cb31cd96109d050c9afb57ee3f6fe818b61d4842bdb476c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external sites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the PDF and its embedded links point towards an attempt to redirect users to malicious content.

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 https://giolog.biz/images/bulk_images/files/rejutifawobovobad.pdf In PDF document text
    • http://patriabrno.cz/userfiles/files/tilonujuduwevikuxo.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-7/20210907181950735364.pdfIn PDF document text
    • http://net-work.cz/data/file/jivujoxowiduxevedeweto.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/87074791219.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/69392952734.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/ligojoledufavomakixul.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/nobaxaxe.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/2353228292.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210901061839.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/bekogow.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/837f8aa7d58b605e8df718c9e17b5bda/74896760090.pdfIn PDF document text
    • http://corkpotters.com/images/65597949231.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/terejosirimoxemepozobe.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210902_023C3118E367D7E5.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/22665764473.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630503087.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/tegavaxi.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/dibijobepaxinonevezaf.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a9d10857---fafofoxolalo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/27238910074.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f776d30e9b---82052723548.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/10914334922.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/88773307458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=format+document+android+studioPDF 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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 17960 bytes
SHA-256: d4b984c2344849632b7c575c63b0ad94dbf629a57bd0f10b1acd03e43147275f
font_01_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 10560 bytes
SHA-256: e9684bb9137890b7bcf58aa03eb6118a70867efa78da5884de2f926c4dec1bdd
font_02_sfnt_off000129e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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