Malicious PDF — malware analysis report

Static analysis result for SHA-256 739fb2053ceb7380…

MALICIOUS

PDF

82.4 KB Created: 2021-06-30 00:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 216569a18287b41c31c990088ef4eeac SHA-1: 77eefa6b4e5af27dce870270777a17da3d9be8ad SHA-256: 739fb2053ceb73802056db73740639cb8624dfcb43ba13aea2da78993735d9bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://mousike.it/img_ins/files/45301361142.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebafcc6a6e---71098894203.pdf
    • https://diedacorporation.net/freesiafiles/file/56008396976.pdf
    • http://app8itebarandgrill.com/admin/images/file/fumut.pdf
    • http://humanitool.ru/userfiles/file/lodoxobilesove.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ab8c92bd---21251638890.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/44229116779.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210610033133.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/83613371076.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/4jck11csrkmcbtc52f1vjtf916/7822327709.pdf
    • https://amitadevnani.com/userfiles/file/68216984159.pdf
    • http://medica-eg.com/userfiles/file/juzoduzod.pdf
    • http://autohondl.cz/userfiles/file/xipudawojumawebonoforu.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9cbce4e96---jikalotowaxoligorovujago.pdf
    • http://border-inn.com/CKEdit/upload/files/83571503411.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b0333b23e---64406070087.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605318f656---ribazetopekadak.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/xubazenegifikuv.pdf
    • http://engroupe.ca/aym_image/files/folivapekukonufavizok.pdf
    • http://b-solutions.net/userfiles/file/234332690.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/11945a702028f0c69dec78c5b7dc719a/87992402849.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/86da41b6b3a40a2a1e612b6e89351244/24938233922.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ipv6+link+local+address+example
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e2.bin
548c03e9344b7055d22c1ff4acf733b7f9e24722cedd3cf77ffd03e9639a90ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 10956 bytes
font_01_sfnt_off0000ef4b.bin
44d208e573974dd93f7ffddecb31a5fa79cda8a771c5ac102df8e840aa3240a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 16880 bytes
font_02_sfnt_off00011ba8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 16792 bytes
font_03_sfnt_off000133b5.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x133B5 1700 bytes