Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c8081ca16e1b01…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 16:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7a50a6867e8cfed18f5f82fcfcc0a39 SHA-1: a8cd89e66ff83d706c433eed94cc65a920e988cb SHA-256: d8c8081ca16e1b0192b30e106ea84d4694d53567b2e36d9baf6a4fc2e94b9256
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs indicate an attempt to lead users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/818f947d87b6c48a1ae03655d85579ff/41260130238.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1551b4b918---88240497499.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/gejujalode.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/88243121756.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/24b884a29e2c95a852eb1530419e555d/votupotogugugonijowusemat.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076445ee4a13---52572173686.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a814152d200f482c70f0cc64eb3ec991/17932303631.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/pojegetedoxite.pdfIn PDF document text
    • https://doitoutdoorz.com/file/ZbHiqAK8zjrR1RaS.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210828130725.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/jelibamolawipuraraxorav.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/15055711875.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/81676189272.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610b37a758dcd---19219898982.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c64c3a2d767---33161193403.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080356e6a36b---gakuvapedojekogapi.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/13331774233.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7d020f8c---597117801.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/kibuvumuv.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/14c1588fe48e348be31c35b2cf261aba/32816020847.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847ec3a4d2d---zokegamil.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/16158816604.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fbb69434af03f84f8d7636a8c9a449d5/15918341356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kamachi+6+in+1+manual+treadmill+youtubePDF 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_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 11032 bytes
SHA-256: 30ff4046e093ca44a889ca36825558c9c2c47a020841f5dc94a886cd933531e0
font_01_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 18132 bytes
SHA-256: 376d97a41b6cecede6c070af223ce1a6108ecfa89c5aed6e0c9c806a65c3a5aa
font_02_sfnt_off0001329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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