Malicious PDF — malware analysis report

Static analysis result for SHA-256 231cd4d9d3855eb3…

MALICIOUS

PDF

87.0 KB Created: 2021-07-30 13:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c02792f0f9aa88f053146144cf86038 SHA-1: 9fcc2715b5279914e28938032a77949c285b96b6 SHA-256: 231cd4d9d3855eb3cde7f9f39413f01cf8b3c300715776be8fc6771571f2bc74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates redirection or further malicious activity, while the link farm aims to lure users to external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=wonder+woman+1984+movie+length PDF link annotation
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/r1pv967sjrmsu3ml1669eqedpi/39448827787.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/xagiwojipoj.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/21051484618.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cdca5ba7b---47061133018.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/94004869231.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe6d815ad---91461417054.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d28e19fde85899dc6611a2a9f760f91a/fifis.pdfIn PDF document text
    • https://dineflon.com//files/19476459463.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/feforonufatajeriginujokij.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/9ukm6vn37hc2n8sp4cfhl61o0v/8069080962.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/37481126676.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/lisedu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b24b9851---tavorefipobibesew.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/sunutifapamanox.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/70037887109.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd19fdc6e5---fifazemoditikewoka.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/52fd935448199ccea48759ae8cf74a79/fotalodujewoxat.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/73kg7krtmp4v8i8c3asc2csk34/83964719850.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f43f6d694---57659476060.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c23cc705c---2121540670.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/3477d5e3761cf9208ef2a25c852b3e29/36602180044.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/dimizipavaja.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_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 11176 bytes
SHA-256: 3f712ce4311ab348c53b37d4399239010ce2a94fc6161a506f9f7e2ea3f04142
font_01_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 16912 bytes
SHA-256: dc80f49fe134b408d68967ddbc243c59909006102bb761a651a6aaa2ce50aa52

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