Malicious PDF — malware analysis report

Static analysis result for SHA-256 f003428e361bd71b…

MALICIOUS

PDF

87.5 KB Created: 2021-08-02 05:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a73128602287d695771995dfccfc7194 SHA-1: 09a9304342938085334e57aafa0539bdf44605c5 SHA-256: f003428e361bd71b84770036930ae9c6cb1e1700d8e57d41555b7cb95321b0b4
256 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing attack. It impersonates PayPal and attempts to trick users into revealing recovery secrets or private keys via embedded links. The document body is heavily obfuscated, but the heuristics clearly indicate a credential phishing lure and the use of compromised CMS upload links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://queure.ru/uplcv?utm_term=best+bitcoin+arbitrage+platform.
  • 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://queure.ru/uplcv?utm_term=best+bitcoin+arbitrage+platform PDF link annotation
    • https://solener.info/ckfinder/userfiles/files/mosuvobexoza.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/83036594010.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89b726da9---21883596389.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a60a5eea---27006153326.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8rff1p1ehruqr5e3ch7ffc4sfr/76071280006.pdfIn PDF document text
    • http://feg.vn/uploads/files/zenosoz.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c8cda0dee3a406fd6cf5d4cfb5b7f3ea/45034069015.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/rotunilifex.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160830a432e59d---88377197935.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210613074558231.pdfIn PDF document text
    • http://scantech3d.com/files/77690818398.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/31584863299.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d28c62bb3a0---mizamurofolinerisadajuv.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/pmi3sma5c3qae1avdhv8415u50/23993883037.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/5987e2c9e9cac3f3d9a655b41e375b33/nuwigagof.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/1411221882.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/retibosanivekekot.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ef22aa3068138370a239c02b7a5baa92/75874440286.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c69ba49036---44580235380.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/kugubatu.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/fukazexelejokofitezesebo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1890a26bf7---57751238718.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_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 17620 bytes
SHA-256: 984ba867ecabee133ae4965f19c7c01a00853e7af38ced68342976c865fcbbf8
font_02_sfnt_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 11016 bytes
SHA-256: cc846b5e1f00513c0a0113793d7e0f8192e60b4be08f32731dd29a5cf008a31b

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