Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ae5993aa3f8d13…

MALICIOUS

PDF

78.3 KB Created: 2021-08-09 17:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f86efc80417bb8005256d1bd0d671621 SHA-1: 79e0aa11616c3ebd902b23e6482f1974eecf3338 SHA-256: 37ae5993aa3f8d13ac82c3910fbc0d428c868e5844eb1fa7d49a07ebd2eca33d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nedimgame.com/calisma2/files/uploads/zuroridigaferivalenev.pdf In PDF document text
    • https://bangvetthuong.com/luutru/files/55961028325.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/8044789661.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607617ab0d171---jutovemuzizoni.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/gifejip.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210720103155_g7iko4.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/newuloporuvunijaju.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771835e32e4---fekez.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3062099c9e35343db33e2f0b24336307/fepow.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ccaaa2485af---43712264142.pdfIn PDF document text
    • https://securitydm.com/slicice/file/66394392033.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/guwevilum.pdfIn PDF document text
    • https://digireg.ru/upload/baronowefefurovelaj.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/59d30297a555f6564c824b0c46e05da7/gedowofikavadagoxar.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lvneat4adu8jabmrm0n94pjdao/xuvesanusas.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccd4fad568---65881104214.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/66297619485.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201a4a6107---pokazuwetipakotosorusewor.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d148f0c40---legirolenawezovagorogowod.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0042cde4---pitozu.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/25795743286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+use+wella+color+charm+additivePDF 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_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 17272 bytes
SHA-256: 674202b304dab1cf5bd421b4be8764c4c41e56135b795fc1f793baab6b1dd7d6
font_01_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001114d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 10776 bytes
SHA-256: d7431ebee1e788f29e2ebc2f928cdaff2745a5d025b533e5a64cf4516366947f

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