Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5b275382376e57…

MALICIOUS

PDF

89.6 KB Created: 2021-08-21 05:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f875a97ca4517d9cddf1ec4a6ceaafd SHA-1: bb02024bbd4887de784d4309a47929387faaa097 SHA-256: cf5b275382376e571992b31ca5c34c7f0724e2978437c0388dd54e84e4ba78e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://aliotoconsulting.com/clients/862286/File/jemewitogufijemuwi.pdf In PDF document text
    • http://ugyvednok.hu/userfiles/file/bofuraginazixi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eda7f5575e---20103703142.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/pg7po51nvj2l014sbkvqis9aev/dobazoxavitetodajedudipe.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/3278908109.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c59788041c---wevemaf.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160983220c62fe---vubasuseriwebetisadunigud.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/pirolekoge.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/wowivaxejijonejoneboresu.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/befubagu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8e72fe90---bedokusuvexiwesojozena.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/c1d10k0nml3cub2nsri5ik2be4/20827891602.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/9kikt9qn0mgo19n6dkrd961e26/bewijag.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/qa256g4821lbh2be70dp1jo303/67427687579.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4e2128a9e8f1f13403491f1613d84207/9328346618.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6713860d5c99de71fe3bef03df9e187a/giduwukadesimuvup.pdfIn PDF document text
    • http://ore-processing.ru/d/files/suxijizaxiza.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/94992583119.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f0d0c9847---90319588936.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/34341f17af9387e9fadc9579f80c9d03/97118266748.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/76uh9q1psgfbk0e3u082n05kr5/xegaziwexuxemosesisemad.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1aeb704a23d2d1ecfee46ca3a424e1dc/74768497794.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f24177931d34fb87fcc9fd6735309919/38025661031.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/33468256004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=teacher+day+book+template+pdfPDF 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_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 17904 bytes
SHA-256: 9af9c40fe799ba6cbe940cef10f414a7534e02c00c2d3f33e667c69c4eb87372
font_01_sfnt_off00011e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 10832 bytes
SHA-256: c538641e8cf69fa4a2651d15822f1ce0f3614212c5ff5a7705e1cae72dafbfa1
font_03_sfnt_off00014f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F51 1920 bytes
SHA-256: fa46c19a9a23f2fc24b8a09a6141eba6c2732601bd9d2c22f28552ad7e91a10e

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