Malicious PDF — malware analysis report

Static analysis result for SHA-256 354450b2ae4a719e…

MALICIOUS

PDF

98.8 KB Created: 2021-06-26 13:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0eb529bee293a240e7496c869688ae3 SHA-1: 58a4c76cd3a66eb121f9e4150fb4dde1dacdcb04 SHA-256: 354450b2ae4a719e3f13ae4404ba03b3dc4ae2818b993f6073ab0da0e805b30f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious PDFs. The heuristic firings indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://huntic.ru/uplcv?utm_term=color+square+personality+test
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a226ba2a364---veredolumutamisukexabiv.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/70959296507.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ca4oojhnqqb5e8v0pfnbgmj7ng/tovumerovalevakipul.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qeqk3cjhq946l0rd74ct4cdf4/livelapubejobowolotum.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff66c9cc66---58860644012.pdf
    • http://modnyi-buket.ru/uploads/files/surutotokegabotedigodami.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a5a625f4---gatikuxakari.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e300e03d1d---10186072432.pdf
    • http://cp-1.ru/userfiles/files/jamuz.pdf
    • http://slp70.com/clients/873855/File/tivuvesasajariramewilimuj.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/768f6d80161654ed33f28e50fad4adbb/nisanivapejup.pdf
    • http://technoculture.cz/admin/upload/file/86118551664.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/2566dba66c86e8e1c458744052549741/pumoda.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b204ca697e4---nudomanukobogedanelumob.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3ofa0436f9rnbucp2g99nkj886/lodaluni.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608498003fd5b---60694564038.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d472b312a8.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba432d8d0---22181945525.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/36053648647.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ca786d26e3bf88c8afc3c954b0587a69/fugaji.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8f7n2n7tu70660aeslkt6a56n3/33522238112.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca54e8587---21079418231.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b312405aa72df534eed10b31a0d1e8a1/36438823295.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5156da859---61751665162.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 16792 bytes
font_01_sfnt_off000120fc.bin
a833547096103f7ced777da86d651c4d2d96f7c2af40ddab6f127e2a9c2cf3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120FC 17768 bytes
font_02_sfnt_off00014f10.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F10 16312 bytes
font_03_sfnt_off0001651c.bin
d4d8d44282ad4329a9a531bddecc21c16d2bf4c530303e5f4daf520f4a2ab8bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1651C 10636 bytes

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