Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b6e0eb36ebcd95…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 20:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a592d3b528612d5d6138fb76e9da349 SHA-1: d35954f16af5cb8901c6732308eef61b31e9a4b4 SHA-256: 08b6e0eb36ebcd95628e66fc65b6647fdf11fc62a05b0f2d5c931986b478e423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or malware downloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nepalonetours.com/userfiles/files/pibaxoba.pdf
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/sepipaliwo.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c254affde217bcee28fb8c82b7baa555/30900703374.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/86657831296.pdf
    • http://houselandia.ru/files/gogisopi.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/77a7435c9d731bd2bf0837bb73682c23/84191834037.pdf
    • http://navigator-nsk.ru/userfiles/file/pukamugubok.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e5e3eeffcc4c9392064cd4f07353347b/winenexixusiforedojorolu.pdf
    • http://epoptavky.com/is/images/FCKeditor/File/73065048837.pdf
    • https://et-auditing.com/userfiles/files/renofobutiwenolevu.pdf
    • https://allianztc.ro/files/file/wolugezezifi.pdf
    • https://likeevent.it/writable/public/userfiles/file/xabirigikodo.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/94620204124.pdf
    • https://dukeofmarshall.com/ckfinder/userfiles/files/zogifinunusufoworabu.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4i0mkrb8bc7qmhq5271s985alp/30686282466.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bcd83eac9---tokuwakusakupivi.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b540544d61c---28021905981.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fbc5d3a99---kosuwekanigoxukagibipi.pdf
    • http://thailaundry.com/imgUpload/files/tuzazonokaxukewitovidobub.pdf
    • https://nepalaviationmuseum.com/userfiles/files/wesafor.pdf
    • http://hitecds.com/userfiles/file/fijusazuwexa.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/86321535703.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=kitaaba+islaamaa+afaan+oromoo+pdf
    • 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_off0000c472.bin
2ea6251fd7cd6f318bfbf474a917d02fe72dec88c4fa88e782f0284a8e033331
pdf-font-stream PDF embedded font (sfnt) at offset 0xC472 10660 bytes
font_01_sfnt_off0000dc95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 16792 bytes
font_02_sfnt_off0000f4a7.bin
0ce36ed895cbebaaf75e60f558d234fe938b9e8384e8223564393d17bb1ad33b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 16920 bytes