Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f519d5176d5b54e…

MALICIOUS

PDF

77.4 KB Created: 2021-07-06 22:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4107fa0d2ce6375034ba73750d096ed5 SHA-1: a21a2188d7c39c7017c0ba4d0ccc4db133392bd9 SHA-256: 1f519d5176d5b54eebc4a9708a83c73c9c9d40e01a1351372772546129b7c910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and potentially malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://oniceh.ru/uplcv?utm_term=south+harmon+institute+of+technology
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073014ce613c---79695807197.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc789bbc43e---fifozofudovebozopiterogip.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3acbba89459836d9ac608a66741e0db1/nimeruxokod.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608621f92279d---fakixijerave.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a91a080b---52545642840.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a46cb913e50---sixavivorotixobala.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/428fdlpsprsbuj9tglm7nnpe65/29972677792.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/912e7b3b6b2145ebe374cdf18a5b4a12/tevajus.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/33bebc7d2dee4e19594598fca5004815/96933938554.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f2aa4bd8---bedokimawi.pdf
    • https://fivetc.vn/uploads/files/63834315556.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c2u9cndbrvggr07r1be37f90jh/nebidasukijasosazokosomul.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e63qt0bpn4anedbu52npsi5h07/62580774351.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b65b22dc172---pakogadifodapedadib.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/90083beb32c827a110df603b516cd87e/37142991884.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/de75184963778e6aa39d1f5049b32743/baxowixisisukawujuwevexo.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/28922301194.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41deea18f---80167946634.pdf
    • https://pui-vital.ro/msg_media/file/52038486341.pdf
    • https://fcksa.com/ckfinder/userfiles/files/rupamazitesizoruwed.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/mht8ofqdke03gii7gt8fklrn88/gofigivivibumipisokife.pdf
    • http://ampletrekking.com/userfiles/file/rurudozagokiviwepininine.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/taj9cfduim2gtt00vtidc06es5/20505824697.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_off0000c1e3.bin
dc982ff1c32caaac13b4b442c0de919945de1f4c7a57069aa950daf1045d72d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E3 16856 bytes
font_01_sfnt_off0000edd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 16792 bytes
font_02_sfnt_off000105e1.bin
9c3c50ca7885eb1b87261f6f74ba185aca171ae216209544253fbc3ee3acc073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 1720 bytes
font_03_sfnt_off00010e08.bin
f7708362379dc7a068c30d39960c371175977b62c3b734f9559f6be4fdb86c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 11072 bytes

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