Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c39b15cf6e8725…

MALICIOUS

PDF

99.8 KB Created: 2021-08-12 23:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85efb0536bb41d82774d6dd87a799d42 SHA-1: 8aac4a62fd47f87bbaaf7ee48a19fe4122d15778 SHA-256: a4c39b15cf6e87253031a176ace08da5b7ebd785f99e6116caf64360ebbf6d72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=monster+manual+5e+page+206 PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/cc3661277e9e49c51b8ff0a2d6ec59c0/rixifa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079325a2f762---59205087986.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/60989170351.pdfIn PDF document text
    • https://mfdesign.hu/files/file/fawudibin.pdfIn PDF document text
    • http://e-hematologica.com/users//file/wigerun.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/9602679399.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2763db2d40d853fa78aa11cc9b5fca2d/96865492522.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/91387014760.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/5f07050786da4bca87b92ff56d44c66b/kaxonitanozuduwupegetuxi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/lksaef9psinjge83l9c1lm5g0d/90353117932.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b790720b8630c5d0aad9e47f73264f5f/kuzuvimikokolojiz.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vobawiwopotadosijewi.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/59628099076.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/o7ne883deli380mt1u33s7baaf/80160735995.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/77587415979.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/250da9d98e4a3002b74009733fa0cdc6/30323392423.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b896f601703---xodurebomuriputiwokudur.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/bemuko.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9ed975f5c10c7826f475c7b0ba7bf386/dilemevutiwonerosiz.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/silisex.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bca7b1abd---68623874760.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/60933991126.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rgohji244bucnj2651lsfpq2ph/xubujipezavumopumaz.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a1occs2qq41c7hqlcbl3d59ft3/dawapo.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/69899393823.pdfIn PDF document text
    • 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_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 11140 bytes
SHA-256: e1d13f672fc166bdea485761069a839ae58db9ec209162206c80cafbd1736f0c
font_01_sfnt_off0001384a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384A 17724 bytes
SHA-256: e95835e96618ec6c5de331cbe494a34d608941f2b1511424681deb8d734e41f3
font_02_sfnt_off000166a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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