Malicious PDF — malware analysis report

Static analysis result for SHA-256 879b31b37f347c94…

MALICIOUS

PDF

121.7 KB Created: 2021-07-14 04:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 34bc7e37c2b5ca77c095ee84de010304 SHA-1: 9dd8fd3f0bf99fc1af485b3a4cb6258a321c9a2f SHA-256: 879b31b37f347c940065c027c9f6dbdafc289dcf5976961d173f8c9601698ebb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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://piazzademarini3ge.com/userfiles/files/76262004956.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/72vjpmt9io2icjrhhlmab5mr10/wemedapopuda.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210614_AE86D83C83A55A84.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b4b001c3---jazujuxeterigaw.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/01a6dec5a71d305ea8fd0a9088188303/51032453331.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/94511395094.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e0535441d23---daxovanexijifedegi.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/oajtt47f4i7ns539644q1slhee/53286453182.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/19270360510.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/17227861367.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c97co0b87jqm1a3k6us1f264l5/71694062322.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/13549235173.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/eb8512909bee35684b0e553bb01298b8/ripidaworogovijiv.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a881441133b---vujet.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/gusoritulejolilujel.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/97045827977.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/vamcuam99sac0m6hm43q6fovd3/62736499136.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a33a3921---nebifodisuxeretatinumur.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/9115254412.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b92eaa89960128b81d001e7e48370b27/mibexoviviv.pdfIn PDF document text
    • https://istanajp2.com/contents//files/25171973692.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/23987070388.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021070716134623.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/77707323419.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eafd33437---sexokalarezir.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///13066205916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=patent+copyright+and+trademarkPDF 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_off00015f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5D 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
font_01_sfnt_off0001753f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1753F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D51 18936 bytes
SHA-256: 0cb15262c79de00b709927d99675cf26d3250df5e1bdd7ddb7cca44ce828aa3f
font_03_sfnt_off0001be45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE45 10956 bytes
SHA-256: f6283c39db0d93028efb4e50172d07b30fd10fe3eee99b9c1e4aafe8cd9a98f9