Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58d517bbcf9b7c4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 19:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea1d1a1c7f32264897d6d9e0da1e515e SHA-1: 29f01b7ac3631bd61a9d5346ba7ea79c0a06cea7 SHA-256: a58d517bbcf9b7c44a231798a329647c29084f6a92b013418f14b739f4d86d03
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness. The primary function appears to be acting as a link farm, likely to manipulate search engine rankings or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://goddesshair.net/upload/users/files/23535136901.pdf In PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4q059a9p3sdshvrsaegnl2ns4u/bilor.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b0c10c2cc24e36b179a8c661a92c5e86/76342512363.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/tizemaworikefokukusixulis.pdfIn PDF document text
    • http://etnorom.hu/pictures/58461236350.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af70e19d762---molisowujevak.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/98cd5b9528796cec6cbbe04399116746/miweti.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/wumenobogotar.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1febcd9de---77406991242.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/sekegobujob.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/kinoberiraz.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gp5u8p5740k1dsgitlsih5h2c9/wegebekebawoxo.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/zukalip.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/61345158778.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wavotekokabanejudosani.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/32369952799.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/da6a4d1b0ff5c855560dbe3bb3cb4ef3/67347737686.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/49253036159.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/021dd0325f748566ebd9714b2dc9c6f2/rorixiwaxis.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/27252411300.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/r426u2rlgrj690rjo829blng5a/53098563082.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ed71224cb---45708711431.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-9/20210809215105527431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=autobiography+of+a+banyan+tree+in+3000+words+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 11448 bytes
SHA-256: 08c8aa81ad33821a3d1cffc683aefee3e8ac6efc1d75bafd8b1249b5fdad6d02
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 17892 bytes
SHA-256: 69fd0719522a22e8f620bc5b7819293e99fc346ece86b6c7236c206331bcbb6a

Open this report in the interactive analyzer, or submit your own file for analysis.