Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ae4eb4d1c76943…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 03:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db2f5effa9821324b04b97dd61e8422f SHA-1: b3ee49e373b8c2056be6ac843025d7a0d063c9d2 SHA-256: 92ae4eb4d1c769431e64f21ee8f14ce4779b581ece28c139bbd187988ce4050b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=placenta+is+posterior+and+not+low+lying
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cfd4c156bd3---86282659071.pdf
    • http://dietetyka-24.pl/images/files/36623265243.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3e9cb88d---62154759942.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/b72bb4d971911c29e9935a63892fa884/mefivinelulokobubix.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d59d9abc8fbbc5005215ee347f38eddc/kulerovaxobo.pdf
    • http://medica-brno.com/files/1414253879.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/8b49fa1b2a0c1669ea76e5833689d3a5/gotiwedivugogepadil.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdaddc6423---97433199695.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/9nupnitckoinom92qgj313h7e3/53098876123.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4ajgc2e28ljfsje3p3h8cupckd/21016082864.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ebcca6d8462c895b8a96b07d5d241675/15924407742.pdf
    • http://3qlohas.com/CKEdit/upload/files/17366038898.pdf
    • http://driver-jazda.pl/upload/file/nejurezuzojot.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a8482eeb---19235496777.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/398d549db23d6428590b049c727b5907/nulotivabeminadipedita.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8873afce0---vekodi.pdf
    • http://noithatnhapkhaugiasi.com/luutru/files/jutojokijomexolivag.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6ebc4402f84c70bfcb003af45bc80ecd/womifilus.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0de5ab79d---71116939420.pdf
    • https://beatmuellerfoto.ch/userfiles/files/damexeda.pdf
    • https://phu-komplex.pl/pliki/file/kuvuxerejixotusifokar.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/30i0kpp9oa16ter62kb6r5coof/13790387014.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731e98783fd---kesakuwulovemepesepu.pdf
    • http://weforyou.it/userfiles/files/nonebojudebun.pdf
    • http://curry-box-deluxe.de/userfiles/file/9305752110.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_off0000e345.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 16792 bytes
font_01_sfnt_off0000fb57.bin
9a4568b2f824b6cc74e71c7613b3fb9e62ae716f87a3e2117fa49f2552a4bb2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 18408 bytes
font_02_sfnt_off00012ab8.bin
03fd2230c5163490dfcfbd86b362522bfc66409c794fc72afea7a7c203c68302
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 10892 bytes