Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d979506c2e4c96…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 01:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c023b7fc2bdcd307fde9926d3577981d SHA-1: 3a52f869d0612658b03037338e38167ac36c23c1 SHA-256: 41d979506c2e4c9640eda642b3c0ea5433a27e9b26f3a826d6b59bf34011b175
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, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://hglobaltourb2c.com/FileData/ckfinder/files/20210908_845EB516FFE8CEAC.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/87126525615.pdf
    • https://cytairtool.com/test/userfiles/file/20210917_017de.pdf
    • https://rajatotogroup2.com/contents/files/87817431402.pdf
    • http://eco-building.cz/UserFiles/File/84426209913.pdf
    • https://quangcaowebsite.vn/uploads/files/35458567175.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b4e553e53c47061c405062445f4d7405/98560075073.pdf
    • http://imobiliariaimperio.com/files/files/88500085644.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/sirisetofuxijafupuxigarob.pdf
    • http://tochalco.com/uploads/files/tonexekidejugoje.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143b79c6587c---lisixofobemepilimemobaxuk.pdf
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/bixovodalawikutawemesivo.pdf
    • https://quangcaowebsite.vn/uploads/files/49206849920.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/s0253ahn97097kqa0s8s805u35/1226206661.pdf
    • http://gsmontaggi.it/userfiles/files/jisok.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/39485360559.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/gowawajilo.pdf
    • http://steelfurniturecn.com/d/files/waxulot.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-9-3/20210903132500782264.pdf
    • http://www.gonouvellezelande.com/files/48413931277.pdf
    • https://ph2020.org/ckfinder/userfiles/files/bifanix.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/wurexulafanuwipol.pdf
    • https://ka-base.no/images_students/files/4705847184.pdf
    • http://red-persimmons.com/upfiles/editor/files/vosipemesizoxolamegon.pdf
    • https://ndmoyun.com/calisma2/files/uploads/disoralowola.pdf
    • https://educhina.mn/editor/files/miridevabi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wonder+woman+free+download+english
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c615.bin
1c004362debdda3223c1b82bcb50d8c6c8c0b423305b314460f9f99314427699
pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 18684 bytes
font_01_sfnt_off0000f6d8.bin
fb9473dd287c2bee73f2717fb3b324e90ae02af3239e29608315bd680fa80f56
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 10780 bytes
font_02_sfnt_off00010f47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 16792 bytes