Malicious PDF — malware analysis report

Static analysis result for SHA-256 7308cf201b72494d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 04:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfd6f15c58805f1b1b2090a8739d3c67 SHA-1: fed2fe2b369d9e26eb1282e9d6126d068a0d905a SHA-256: 7308cf201b72494d9f5e232586df427263a61966b007b624ce83fdb6437387de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature through its structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=the+voice+android+app PDF link annotation
    • http://frickcontrols.com/uploads/files/fawifoderezod.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/fitug.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/dakanomedutuwozujipev.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614062a1cbbb8---89450501717.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/35750054486.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4vecq9re7hkapl0p3gp7nhr91f/67402438603.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161350dcba1769---migofatomuxixumejufapizos.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/gulid.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/82439651652.pdfIn PDF document text
    • http://roocenter.ru/upload/file/16273991143.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/nupimirexa.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/92824153657.pdfIn PDF document text
    • http://htwy.com/upload/file/26260872014.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f037ab86e---mudolonuwuwigepomi.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/4454804659.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/zojize.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/8033519217.pdfIn PDF document text
    • http://snsi.jp/image/news_file/sazimovo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/62148120353.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/564861636481630975818.pdfIn PDF document text
    • http://dentherapia.hu/files/file/molokojugemusep.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a6b854606---16214530267.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/nutazifewixekuk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 10328 bytes
SHA-256: 5fb5a08f7fe2b9bda4096fcae650c01244c0bf4a211efe6747e81cfbf22e8316
font_01_sfnt_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 17196 bytes
SHA-256: cf81b18988253cf3a2974362b22e5977f95c64c8f9e81c4407d34be43296875c
font_02_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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