Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ecaf48bac61a7f2…

MALICIOUS

PDF

104.7 KB Created: 2021-08-23 17:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d39bda7d55b170272da7fe612c483c5 SHA-1: 137965af703c20c2b5eb2d20afb6ff795ea5a19a SHA-256: 2ecaf48bac61a7f24b9935bc08b450eac41cf0790b3f50bc45daf859dc037177
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or are part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://altstudio.be/app/webroot/uploads/file/25976979883.pdf
    • http://velocimapper.com//webfiles/file/bumuf.pdf
    • http://sheilahancock.net/blogfck/file/75568388056.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/18275237644.pdf
    • http://alarcon-v.com/editor_upload_image/file/xiwalikiduzogapixeposiwa.pdf
    • http://tauroconsulting.pl/userfiles/file/zozavopu.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/tinisogup.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa862a76c---84639115165.pdf
    • http://thetestmag.com/userfiles/files/nodarubijaparema.pdf
    • http://mrcookie.tw/upload/editor/file/040250563689.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a78d349e952---bimuvipapisevizitir.pdf
    • http://gldbirdgel.com/user_img/files/65689321468.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a4630b6ec---rukumixokajegizusiduzemid.pdf
    • http://anandamsanyal.com/userfiles/file/90899591410.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a85d16d59---xosewobuwexuwowanamokuju.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/xafesom.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091060a4393d---xewusuwivolowa.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/sbldnk2lssmcif057oklunoma7/sirevofu.pdf
    • http://ehs1958.org/clients/73155/File/78568186269.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1fc0c020faee87c0c635fe1326070242/pavejapavisigojozes.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/be2cb4139c2f734ff4fb6bc92ba59329/denibovudukedoxawivage.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/bd7dc67a349d912b5b32a9cbf42744c4/bogaxaxewizamixuj.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3aea182e---rupebanosigujizugaf.pdf
    • http://salinahighschool1967.com/clients/c/c9/c9c88be04994199279bceb128c91314f/File/repejovexugajojuduginiz.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/42355616516.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d7a663911ae3543e3fbea868db0c99b6/vusipikoragekadan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=refeeding+syndrome+icd+10
    • 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_off00013474.bin
6f3503dee98003e69f609b6540241e3d813ff22669064dfe4c94ab12ad75d07c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13474 18040 bytes
font_01_sfnt_off000163a9.bin
06a6706a43bffeb803d739cb3f0bb8b21e4661cd5e4e409ce2665a2cd3f62817
pdf-font-stream PDF embedded font (sfnt) at offset 0x163A9 10844 bytes
font_02_sfnt_off00017c87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C87 16792 bytes