Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d08d16dc66fba5…

MALICIOUS

PDF

92.3 KB Created: 2021-06-28 16:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37344d321f14eea9d2c1adce4606c44b SHA-1: 9effb877cf1771e667e9a08c47b9339b5a7d76df SHA-256: 54d08d16dc66fba5d73dd94c1e82a7b214c9f3b1d05bb41dc422a27879428304
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 direct users to potentially malicious content. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/s2g6elts6n45l2v8j4kvds92q4/fejivur.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/71e10ff1e46fe95e68a6a2d58fae0d9c/60350988277.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d272c63fa---posevejavuta.pdf
    • http://biomassasia.net/data_ed/userfiles/file/90288640947.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/45458491777.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160928f1cadf4d---sokomirij.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083bcdb31d79---72402957276.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e119327566c2e7e3576c05b523a0dbd6/18344737802.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160706ecb9e0f8---70411265217.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210526214756.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a484f028644---87800616771.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3c0853c9---64223126058.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/xetuv.pdf
    • https://101doctor.com/uploads/ckfiles/files/60bbc6a591a4e.pdf
    • http://andlupa.com/userfiles/file/29981553101.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/cac0286489e7de617c0f8147ff5e47ec/56332564977.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3vsl18c8tt929dvokb2ia17q57/16249975384.pdf
    • http://stalmont.eu/userfiles/file/jawotak.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/fj6sr7qekoru6kkgcb51rh6lbj/gutigegizafobavumozef.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/42d0e285c24fc8a41d87a15c0447a5a3/diguwadozogapi.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/53166325374.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e063291c5---munaduzekebazo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=powerpoint+presentation+examples+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010506.bin
531a6c298acf141c357b62ffbd4135eb6114c023f99b921af52b39047f6eecf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 10848 bytes
font_01_sfnt_off00011e23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 16792 bytes
font_02_sfnt_off00013635.bin
3135cc3f3aad629d28421a17b64d8bb9dd28acdd848917be4918bfe1a9a8c1d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13635 16976 bytes