Malicious PDF — malware analysis report

Static analysis result for SHA-256 de430ef8e162d358…

MALICIOUS

PDF

84.1 KB Created: 2021-07-29 17:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7bc44f2c3bbd89e27482a2a30f378cc8 SHA-1: 82267dd77348b40a899979d1d93d921142acf510 SHA-256: de430ef8e162d358e6a4802a6f223ebedf44218b4b039cdedf756aec2656498c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11ba7d113ff76c5b15465fcfd1104268/piwelanonopow.pdf In PDF document text
    • https://sealskinz.ru/files/file/33637014448.pdfIn PDF document text
    • http://sam-global.ch/files/file/jelog.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/wujomavonudajaw.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/15275126803.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8tsnimmf9bo3s6dd70rum00b95/senigigupezusubojowupusaw.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/89958315170.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/92217169401.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083979079399---nezaxujoxitinitagowuzisu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nkuiirgdnivdceu04lm8onv96g/45852882733.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/xigeze.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804b1c7fbac---vagulu.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/60784369633.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///nuvodadivirine.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/4949455430.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/wofonukikixejo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0ce5015548c460d67dd62a79d996ba22/13704371775.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8f6dae5a86d19e25b19c7f5976694170/segoxiwedut.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f14037f2b---kilik.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/luvirajusopeditalejo.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/11117408345.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/ba22020b76ec6f9cafe4cd428a1c034d/89380842895.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/54987569707.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f862139184---devewetiperezimisedoxek.pdfIn PDF document text
    • http://nfc.soo.jp/file/6316237315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=douglas+county+colorado+jail+inmatesPDF 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_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 16932 bytes
SHA-256: bc7c0ddaaca415d32dbb89eabaf56fc4c34864b40f55b2af8e0d2c2d8c52fbc7
font_01_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 11056 bytes
SHA-256: 167b88d5bf24c10b08d13030117e67b128ee3cc1e54a9438eec92be29e5b0b21