Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f80ca080827cbdd…

MALICIOUS

PDF

87.3 KB Created: 2021-07-07 06:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be1416ed03175f415d3c3229081108dc SHA-1: 4807467002605f8ab7fb2e27c1ac7c698693364e SHA-256: 0f80ca080827cbdd53a2f49f789b1d626c8cfe21336ffc4f655b5b3edfeb4212
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites. The ML classifier strongly indicated maliciousness, and the heuristics identify it as a link farm hosted on disposable domains and compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious content through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://citytrafik.nu/images/file/wemurusoluxaranixesu.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f595356670d3349c9d463b1728ea38c6/99730047409.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608490a9d64fc---26932628978.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd95b2114d1---64796258679.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b060518e95---13171443953.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/53rrpanbktf8euiipghikh14p3/92622602503.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/c6q076ol8r4dp518utu35omjj5/kemirolu.pdf
    • http://dansensvenner.dk/imagesfile///xegogitu.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f354c6200e---nuzezax.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hbokpe3ikr8ic59ab6r2acu48o/gazugejesewuninisewu.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4f12fcad---zozajenasez.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47cdec1d75---70468280766.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca5f85f911---futarezebabinegegarumu.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf43195b6---retididesiza.pdf
    • https://anandamsanyal.com/userfiles/file/tifozerinegisojakobefefez.pdf
    • http://iglozawiercie.pl/zdjecia/file/80961653726.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/290c12c8f00b6571fb1e25c84a1fc998/nigagisodupov.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/gds1mduukod5h6r4lva0ivhdv1/jopufumepimibevozexe.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ig5n4bi83l0b41vamg307krcd4/zajusasig.pdf
    • https://rugsinc.in/UserFiles/files/13244365341.pdf
    • https://cafesca.net/ckfinder/userfiles/files/6194145589.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5rou37j6ti7mcc7hm2mc6uflh4/87612919415.pdf
    • http://rafaelokazakov.com/file/girufel.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19abcb6ddc---50632799303.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb0086817d---60135057158.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=inhibit+meaning+in+tagalog
    • 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_off0000ef7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 16792 bytes
font_01_sfnt_off0001078f.bin
602a7f9eda68a3364f27aa40b8095fa2fb5581874d7bef1c993e005a1affd7af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 19060 bytes
font_02_sfnt_off000138df.bin
c247c2c85a38a5058fd08edb8fb29322a8ef44ed43d7292527b4c37809480ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138DF 10380 bytes

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