Malicious PDF — malware analysis report

Static analysis result for SHA-256 3564f7a95ad2c06e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 18:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82a74494bfd720297edb3d9b211e634b SHA-1: dd2bb75d1688fe1a5b49bfa91ebc1d9f4188b45f SHA-256: 3564f7a95ad2c06ed9625b7905a727a564f5ad8deeff5be761e184c8ee0f9773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to host malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a419ed8fd---lirezaturute.pdf In PDF document text
    • http://hzbmsj.net/images/upload/File/62429947699.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07c9ddb5c3---zazejovuzimozirunox.pdfIn PDF document text
    • https://ijpdua.com/contents//files/jegexijezu.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/zirutarisugibevusefo.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/tedapivepazirozipebe.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/29/file/jibanopumigov.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/sunibezid.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824bf87b658---tapezano.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/texivadude.pdfIn PDF document text
    • https://le27.fr/docs/file/bifofe.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3c52319f6fa8f9dd3160774d275964c5/gijivebugavixidejaj.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/89185871149.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8edcdc8022eaf4928434c1be279d0501/punokivubirefeno.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vodoge.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/kemuketiranabonawe.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/43603762588.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/fafegudit.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/kezawomemuroralorimakub.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/paralororijamofa.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925fbfe9e68---36727125234.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/wemomogu.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/bspgq1ndoi1vd19kr3097r21g5/vagabofozapamev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=asteroid+goddesses+pdfPDF 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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 18760 bytes
SHA-256: 46dab4a02fa988f8337f5f44d1b939f0d15b0900fcde6848a4397557e3ce95cb
font_01_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 10340 bytes
SHA-256: 2cdd86faf37fcbe3a95efb7a95afe61b533d2bf7b5b95577c94df88e480c5917

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