Malicious PDF — malware analysis report

Static analysis result for SHA-256 9997bc164d5fce2f…

MALICIOUS

PDF

85.6 KB Created: 2021-08-13 05:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 592efdc9155d95c1fba6c24a1cb98ad8 SHA-1: aeefdb94f3c2d1d47cf114d766347e98d969c930 SHA-256: 9997bc164d5fce2f7681e2d5ef3d357ccae53a6ab4fb3ba1e8cb113a70876c39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely used to redirect users to malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160818a39565a9---posiludur.pdf In PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2d797dab8e7ddacd380fcd7a6bcb36b7/lejepafenujuxulikofisu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885b5a49c88---64611384386.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210624061817.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/16417480658.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ks13o078ad9gtaol22uv39ood1/95158308296.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/da40eab52d4391d1c3c03594a0b09e91/guwozekofu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9607f28805d1bd3c52b3d942fe32a3f5/20573182605.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/caeb70fa2a012800811b83552a71da37/26836587417.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606deb761837b---73020096956.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b73708148f1---97135319728.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/20768036917.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db46dcaed87---30891044953.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/duvepemagurobuw.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37721c96e---roxezesopofukomejikin.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/52912364888.pdfIn PDF document text
    • https://cncunse.com/d/files/gogaxixujinewuvokimi.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/9030137152.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1eaf2cd57---81945378717.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18608edd44---mipojazag.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/53123900757.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/uegdjka1u9r4qf4qq069urghmr/89572320515.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/23390142926d9f5f9a437c4c3c253965/lepofaxozimupitukulo.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/24419265936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=oli+castrol+activ+4t+20w-50PDF 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_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 16992 bytes
SHA-256: 45abc0f9a619fe614124f8545e2adbe5042ca2d89d37418faefc71bca5a638ed
font_02_sfnt_off00012f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 10652 bytes
SHA-256: c8154bd5f5c44a5a1f30ba46d16a1d2e4f616c46cdfa096ea86dfa9643ef191b

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