Malicious PDF — malware analysis report

Static analysis result for SHA-256 560f078f52e58c75…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 15:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0228bfd3cbdefcc3db593aab84ca16a4 SHA-1: e5ee156b8ca0593a03bcb212310d691c74c39dcf SHA-256: 560f078f52e58c753ee65ad112be75f108e61c26cfb841aaa6f3fbb41de4189d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of multiple PDF-specific heuristics related to compromised CMS uploads and link farms reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trisyscom.com/userfiles/file/texaloxanifomulup.pdf In PDF document text
    • https://keongracun.org/contents//files/41427863931.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/81693863798.pdfIn PDF document text
    • https://kaimano.it/file/60593875317.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5da5547955---xopaxamabokuwa.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/nevawaju.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e2f4665b7---favadidiluragogeregazeza.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094566cec702---15994451163.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/17845777870.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/22cd5d26bd3b5ecf1424f946eb513ae0/tuwosokupafira.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/328d51dd1e44f1d01d6fe89cfd9ecfb8/galawakamasalafez.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/jutuvawelevebekis.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/93ba061b34ff50b48211592e93815208/jexamokakiwuzuvopodor.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/57863434e6a37d7b5c7c98ca4d781e39/35605871922.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9bb7b46b8---nixolurewinidalafa.pdfIn PDF document text
    • http://erex.hu/upload/file/zejapewedirubogizelujepu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qmj51rsckhjipob3smtmj1oq4l/6081742476.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/50153722263.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb4e54fbc0---34708787447.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f2437778bc65b7a3be93ffdcd079625f/sujojige.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/mdul47i7394gec485jrj9joeb1/rupun.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/gasojesudem.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/zokefalubakim.pdfIn PDF document text
    • http://amandamaitland.com/images/file/99243159988.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d650827fb77---11457222481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=multiple+native+pdf+files+uipathPDF 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_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 10536 bytes
SHA-256: 21de67d16f78a5407186c4b59fe939c32dae4222d06f8a8b619e99a171977d2c
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 18036 bytes
SHA-256: 098b31946883fda49122042dd69b69ec5e325518183669e31ab99d9dce8e342e
font_02_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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