Malicious PDF — malware analysis report

Static analysis result for SHA-256 600ff2aaa6979f5c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 00:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba1ea39f7e41168411d2c201ea129b8e SHA-1: f5e3bc06abb4983e7f0f020e3fecc21119f12f8a SHA-256: 600ff2aaa6979f5c8975e51dedb6e93562817c5931b9cf533074b5e82bde0605
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests the PDF itself is designed to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tahc01vt65rpheco7cd29377r5/zejixafesejamiradafof.pdf In PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/51328975275.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/gojit.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210905002733257.pdfIn PDF document text
    • http://thongthien.vn/upload/files/37601219311.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/65645458847.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/bizisunajumupaf.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/20967216150.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/80861203738.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/wapupekatonabeloxukopat.pdfIn PDF document text
    • https://revive.fashion/upload/files/garuxerubavixokoviva.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/bebutifiwamumuwivale.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/17155724100.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce5974ac2---ropinewagewedataba.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/jukeforapeg.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/83884441278.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161390e699fc25---vupejixe.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/gevanojuta.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/wogafen.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/72545979042.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/viwej.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/zasat.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/gezujoxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=audio+message+from+iphone+to+androidPDF 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_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 17560 bytes
SHA-256: 06799ef6d08038a45163c4ec1ca74690790d6bbff55348fd1dc86beace64bb25
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 10980 bytes
SHA-256: f70cb138426777e14d0f2c8f093650b63f10adcd9c42439c7ea3d2dc0864dbf0
font_02_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1