Malicious PDF — malware analysis report

Static analysis result for SHA-256 320fe01f645b352b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 14:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03754c608397496d8089fbe5be0bfe95 SHA-1: 4e11ad8566f8fca2fb6e7f488a49d65e6b55248e SHA-256: 320fe01f645b352bd3fd80635274b7eaf80677162d18191457efd8dc2e560467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=avatarify+ai+face+animator PDF link annotation
    • https://fnb-concepts.com/images/uploads/files/40924335908.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/vimutulogafeb.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/88544980628.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/11308230292.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/xofibinewezovu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/telekhdj3j2d0d2p18a8kf2fvb/15037216907.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/mitatibuseruziduna.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/50018220863.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/nonewizan.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/gubowoguxuzipejobokeseren.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613aecdf23600---31802292814.pdfIn PDF document text
    • http://pronobile.com/catalog/file/89482015162.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/xoxiwafi.pdfIn PDF document text
    • http://ipublicity.cz/data/file/puxidarenufutebilus.pdfIn PDF document text
    • https://songhongresort.com/img/files/1881482352.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/motoniduzoxedolemur.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/ronubugavepirosoj.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/derewawodivumut.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b948354b2---84741680045.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/49153522217.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/0dvj6h8rmjjkdpnlp6f5vbliga/manobugufek.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/12916709984.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/faliseb.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_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 17232 bytes
SHA-256: 990135b32a93b5a72ddfdfdad53f3948c8119a4989952a729513bd42c1b2a238
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 10444 bytes
SHA-256: 2e96558a5b6bd9af94bd379b7af80a3b6e8aa3133420c61e60cfb0d2d097c922

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