Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ff090babbfd165…

MALICIOUS

PDF

96.3 KB Created: 2021-08-11 12:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8f02151945841663ee596bb39905b070 SHA-1: 867d6a925b707c333ec994caa2197744c767d424 SHA-256: 97ff090babbfd1658a67b58c99440dcdff48066184484ce3c7f77a2b10aed633
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The primary goal appears to be directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b683e797b63---regekofurepekudego.pdf In PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/wajeguburavikiv.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/48837248868.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/lukikiwemedimux.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69f40559f---63243648738.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/11311028921.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/97103581804.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/lajupomatikutolemef.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/uq6kpk823gohmp7fudp0pc5f37/joramusiletepedowopi.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/selapobatuboledajatewofod.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/93774302529.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607246a5e98a5---lijimanujunanu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fca2a2b8e84---rutatotanaxukovimoneti.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/96016673391.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sitofuxuz.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/pikikexiborisogaxefupemi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b612ea9c89c705a6b818940e6dbc1473/zedozudiforuvipigutolilo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bf59df127---3087572435.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/daruvov.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c301d17c1b1---98775323852.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/66151541112.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/18342522375.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/dufukogesitoriledebinuv.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/62246030260.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/23952192268.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/44403711902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=atdhe+free+live+sports+tvPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 10376 bytes
SHA-256: 559dd4e8aa15642db72150a813fcae46101fdb0f00518f90c7fcc0708b58b392
font_01_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 17648 bytes
SHA-256: a42451eb4c66395655e05632512fb51028af55b13ab705720a59cbce97857da5
font_02_sfnt_off00014392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14392 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00015911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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