Malicious PDF — malware analysis report

Static analysis result for SHA-256 60878f4c78909d30…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 13:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f233f1f14b7d0b64deefd9cd8fc7845 SHA-1: b86eb8980e46bf1e6530430f1bc2b6af94423fb7 SHA-256: 60878f4c78909d30cbfc58b516e35c0f270dfe6af34d4f46ed8600b45634f7e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious 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://medvor.ru/uplcv?utm_term=nuance+power+pdf+standard+3+review
    • https://infotechb2blite.com/bot/ckfinder/uf/files/74568770289.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d446e1c414---96096388191.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5a708ccb258e0df2752d4f9422402c8/13156862314.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb3b484ba---futaxasewexojovesoka.pdf
    • https://landtop.com/filespath/files/20210904020753.pdf
    • http://seoulsquare.com/userfiles/file/1215478602.pdf
    • https://seerupit.dk/assens/file/95698922329.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/bipalikop.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/88c2ef356468cf11d28549847bb4f60a/27876761314.pdf
    • http://uci.ir/userfiles/file/jawewarapi.pdf
    • http://bitite.lv/media/txt/122/file/74814941246.pdf
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/samimedaniluxefepolefofaw.pdf
    • https://avflash.nl/upload/files/20705081336.pdf
    • http://osstemcardiotec.com/files/fckeditor/file/12238813746112945a0f995.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tawobesupupekobel.pdf
    • http://zsdbiopharm.com/upload/files/79228727264.pdf
    • http://beautifulmoda.com/userfiles/files/21971589628.pdf
    • https://walkandsmile.com/userfiles/file/sunovutin.pdf
    • http://homeopathyhongkong.org/files/16733779302.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/v8jprs31rskgvna6cuaqilt0rb/kigame.pdf
    • http://letresorellebio.it/userfiles/files/66589430601.pdf
    • http://marinapogon.pl/upload/file/96509010821.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5992f05241325d1cc32af8442308a2af/zerirojametela.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_off0000d818.bin
9c0cf6825a922257a8528352ef568cba6d308c485a0bb5896a1b3a5d508ae5c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 17328 bytes
font_01_sfnt_off0001052a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 16792 bytes
font_02_sfnt_off00011d41.bin
af3eb3516cf303a5964e3e18325f64d8502a8d266bdf79acb60a5a7f3a28bf48
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 10968 bytes