Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bc1641c67ee201…

MALICIOUS

PDF

93.1 KB Created: 2021-06-29 07:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 113dbe9d5d9aca551a8aed20ae018919 SHA-1: 41749b0f5d772efa949846258521ec3db52d31ba SHA-256: b4bc1641c67ee20162c8c822fd6656e7ac1524aaab226eaefc7bf9db69b307bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://synerhu.ru/uplcv?utm_term=professor+layton+games+in+order+of+release PDF link annotation
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea9df7a562---jedenonepezinam.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/vatesazal.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/p09p99a3jqnavfg6h8lbvnn0m0/58582969952.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fdac996883446a111da12780924c1a18/28725002018.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p7v1la49jjv6pl54j5hallajcl/60608267314.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c3f92b46---99880834681.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sopaxepara.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/xiperaku.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/wetutazulixakolisu.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/sizudasagem.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a518aaab274---ridelebagawajakasexel.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/67821270653.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/93470350324.pdfIn PDF document text
    • https://medtek.vn/storage/file/35631546412.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/413a4dfe353c767b3b1b7daa60d04fdf/75749709621.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac040c15a0c---bunopajag.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae353640126---zelezimexomewatog.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b1855f7126fa360a27df731922d0d8ff/wudenigexez.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f3926e6753afcb94b707bf1b1ea49f38/7204974606.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/15216902829.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d38998f7d---xotonetunidajaferaxov.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/sovagoliriwodiramufozaze.pdfIn PDF document text
    • 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_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 2940 bytes
SHA-256: 168bca1da6b1f7041674de919ab8f4d3190d97f6fcb0251118adb570dcdd9c12
font_02_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 18256 bytes
SHA-256: 54db88e25de8f360be6ea6e3d8c75ef9068b043905896188a0c26c6cac7a3e72
font_03_sfnt_off00014de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE5 10812 bytes
SHA-256: f3af736f11d68ac02733a7e1af17615713cd495cc2bbe2ca0f1152b3b80f755c

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