Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7457c53ddc9ee52…

MALICIOUS

PDF

76.4 KB Created: 2021-07-21 06:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9bf6a86d88b81d40d887b8269e7e65d9 SHA-1: 2c93cbb8955530096841aadd55e7ac551e779d77 SHA-256: b7457c53ddc9ee52fa813c9aa6a051c56bd0eca71e72eb3fa54843774c6dd788
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://blugarden.eu/file/ledozidulebunipepaguxifam.pdf In PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/57912217276.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/jikiruvutuzaxerolas.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210605_48DE7355A52EECC3.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda88b7e16---mejivujakipazusalibexo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/46e6cdab63c43bde722043cf896dc3e4/23364084098.pdfIn PDF document text
    • http://capri.lt/userfiles/files/xaxemogekokovivo.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210503122725_957699320.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1e0180d8---telot.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/40197470239.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ggvr0kmjvd2akc775sb1lpil3c/8056472959.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1d6a434166c4114ada22c77a25349165/jezoniximala.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a492dc075c6d2ee379382ae3a877a009/zegamu.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/08226af5bcde5ea009c58e1afab7c014/98509774771.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/13b155fe47836b841fc407a928074ef2/50886480791.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a807f2bc5e2---52611491775.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25bf1bc54b---jinobesiw.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/38968001867.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d670a4f093---kifojo.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/15959612176.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2ef04a4947b23a1b8a8e0e4589233690/vafaluxibegomagemore.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/forizigapixigud.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6fc265b1ec03ca8f82dba66b971ff285/jowoxaki.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/purasa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ecq6vfb3a910k96bp6gjbr8h82/toperusenijajunuluweve.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/38567979714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=figure+drawing+malePDF 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_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 10368 bytes
SHA-256: 0ad42129f62153340daa05c3c3d94bc984696c575b7c7d43239983ae0cbd5611
font_01_sfnt_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 16648 bytes
SHA-256: e51a62f3bc3cb06438624dcbb168d6d0887fb12baf5b949aacc87de392c60359
font_02_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1