Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8faa86e8a882af…

MALICIOUS

PDF

68.7 KB Created: 2021-09-08 04:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee2530c664df092cf4e5d1a1a5a87703 SHA-1: be7590c500af0a9a718af04ce1322e3915d068c8 SHA-256: df8faa86e8a882af9915c0c1d2176ef0f2e4f602f182ee996acb6171cc521db8
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, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sns.hu/_user/file/jujulefudiluxeg.pdf In PDF document text
    • http://risorsaterra.it/userfiles/files/12315005339.pdfIn PDF document text
    • https://wsbtitan.com/images/file/tajepefikepe.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/biwapuf.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/liwilumojorifubuvovafefib.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/nafaduger.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/45721381466.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/34931833503.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/fapazopejepuw.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e77fa0117---petunepavikabigapuje.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/xazisivowixo.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972c6e1427c---41801964740.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0409b997fd53279dae12246e26fee6ac/velegobutewamugikesiluxi.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/lofesanujokowupabomavage.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/xugidavebuxezogumig.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/15410864099.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5632a16c5acb1aa70e69c83391d47f85/32067159712.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b80aac41c---17040157223.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/55942226286.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/32c95b27a12ba5b1636d288e473fa3d6/rowanagalufoxusilit.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/doteviwidetupepar.pdfIn PDF document text
    • https://netlandschool.cl/files/20740066907.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1a3d40e9---voruwulatareno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=portfolio+management+pdf+icaiPDF 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_off0000afef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEF 10796 bytes
SHA-256: 04300457466a879a8fbd316e29b87a71f25d613c3681022e68b0dfb807a2f6c4
font_01_sfnt_off0000c88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 14984 bytes
SHA-256: 1e72a65739f28002697408fe2f93709c9d5151ba5a5f78ede31b0bfa44cedaa8
font_02_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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