Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28c722a3b1f26f7…

MALICIOUS

PDF

132.1 KB Created: 2021-08-07 17:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3bbce94b2fd392738d4ff18219913910 SHA-1: f1fd9be7f39c9d23388840ef18e7429a697bcc2c SHA-256: f28c722a3b1f26f7f2cac540bb11a2157bab56a81cc80248bd9dc83231f60850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further exploits. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jjinline.org/file_upload/file/97367705213.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9c0d0a64bf928fb528cb66c91c17be02/kiwesavetebezonebotulas.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/39374527607.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/27696783758.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/oqdthrbe7n7qoilkd1f12aensj/22043390622.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nomitumixugoveki.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/65456415191.pdfIn PDF document text
    • https://medtek.vn/storage/file/13922346968.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/15145209724.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/36290982819.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/mazapovawukonox.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/r94kr1pctvt24kmn9rll59kkv5/fewuredabemebe.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4cb06c8f64c4c23f30d0ecc7dc8fd329/bijagoxawazevosibix.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qt8jq915m6jo5si5eogl164d55/jokedivupusaladimused.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/kifimenemiwa.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/55704001385.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/83015600726.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee1876645---92023532903.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///28176647610.pdfIn PDF document text
    • http://cabini.it/userfiles/files/motorodujiva.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ddb46fa31bfb277fd87a059c204c25f4/9545943165.pdfIn PDF document text
    • http://iwishop.hu/file/xegilowelegaligisale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=biografia+de+anaximenes+de+mileto+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B54D 20572 bytes
SHA-256: 1b9cf387db196a55b0fede3e9de205bf5097d2b2de9c46c045f62e3cbc3c86b7
font_02_sfnt_off0001e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E74B 10996 bytes
SHA-256: 69b4e909cd2bd958a53b3c04bd3bfc5fa5791980f44c77749ecb382dab4335df