Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d50f3c3cdb78d7b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-20 13:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1ed6e21b56dd76b243bc967f145c0db SHA-1: d5494d67aa9a7debf42fdb09a8f77a52fffa970d SHA-256: 3d50f3c3cdb78d7b90ba15f24ed7d1e93327225ccdfc935a99a19133db1fb4f7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser update or extension, a common phishing tactic. The embedded JavaScript and numerous URLs suggest the PDF is designed to exploit user trust and lead them to malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=how+to+download+operating+system+for+android
    • http://www.thaiboat.net/image/upload/File/93840170139.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ennjm0kg1h86bt3ggtmpl1ljcb/46902503391.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/poposiki.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e2d3eb02b60ac105b2ff8c315a4af08/33125781039.pdf
    • http://jatyn.cn/upfiles/202109/file/1630646572.pdf
    • https://astefin.ro/ckfinder/userfiles/files/vakufu.pdf
    • https://lideregitimpaketleri.com/calisma2/files/uploads/9742243176.pdf
    • http://nfraccon.org/userfiles/file/wazesuvekazekajux.pdf
    • http://birdwatching.sk/media/file/logebadaxired.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e1e592aae2202af336ae926b78a3fa1e/49624994567.pdf
    • https://databaze-zdarma.cz/userfiles/files/62180285900.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/51260824555.pdf
    • http://dulichgiahy.com/upload/file/70122334014.pdf
    • http://elitacasa.it/images/file/lisawivisuzigaf.pdf
    • http://podolsk-kondicionery.ru/upload_picture/file/timamidawafavogenomuja.pdf
    • https://maturana.cl/upload/file/pawepiketigetokewiwusijur.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/70437fb01f68456c243d08b58d48ad8d/76118125508.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/58264284528.pdf
    • https://butagallery.com/userfiles/files/30770721277.pdf
    • http://tomei4x4.jp/js/upload/files/lilofix.pdf
    • http://collectifff.be/imgdb/accueil/files/39518945219.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/56667607762.pdf
    • https://cottingham-group.com/cufiles/files/29146654263.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a1ac1c992---22416182234.pdf
    • http://xn--q20b13r9leepaeb.net/upload/file/202109180621197926.pdf
    • https://yukkumpulgroup2.com/contents/files/68239112920.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161390136168f2---vumizaberetut.pdf
    • http://krzeptowski.pl/file/66617824719.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_off0000ecba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 16792 bytes
font_01_sfnt_off000104cc.bin
c57c7700b990245ecfb417d6aa332ddf6db05787c9d6e028defeecc5b9e4b208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 18148 bytes
font_02_sfnt_off000133de.bin
73655e65618ea73c02680d6e2b554948f46d452aecd1149a93c6ab56a117aff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 11032 bytes

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