Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb810d310315e27…

MALICIOUS

PDF

85.3 KB Created: 2021-07-06 16:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7d2f0c76a595887e960544b936fdb045 SHA-1: 297f9885166413e3f5264ca6e9a0ecbf85a99025 SHA-256: deb810d310315e276697cbb29ce69a0741529b463c9ad36e6146bdfc2c341a22
236 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users, with specific alerts for a fake CAPTCHA and a payment redirection lure. The ML classifier strongly flags this PDF as malicious. While no scripts were extracted, the presence of numerous external URLs and the nature of the heuristics suggest the document's primary purpose is to trick the user into clicking a link, likely for phishing or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://crysiq.ru/uplcv?utm_term=instagram+picture+viewer+private PDF link annotation
    • http://18554080.com/userfiles/file/19768618462.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/fozuxiwunoxigotudetoleg.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/0f568b86cca3f028e9d44e2fa19c9323/4993302595.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/74922559906.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/wogim.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5a6e793ba3542845e2d7b44e2b572763/kijopepis.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/goruvomuwabukotibesila.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/83a3ab6abf2e52ace30692f6d2ff9f78/20174116418.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/komulejonuzizumopugiza.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-17/20210517082603803064.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/47032284681.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/kijuriwu.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/57172166664.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f389e26c5b---65121133651.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5a5355d6585faadfdc683cd13d079e18/46864091708.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8594b8f9408dcc1a26d55367a634c318/ketazore.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/pivejufujafebupeba.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5aa29580d---dokebenoxejonasol.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bbad20df0---lotizu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3aab498b479c904fa104025eabe51f31/kozifemowexitijivemibu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e35073e5c249bae2556592a1fd4028ce/7379419059.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/novoker.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160916cf0e3010---68194574262.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/xepixikogizedijewomevo.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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 16696 bytes
SHA-256: 21996612b1a4966dab37c01354e4492397fef3ab4469546c9bb31cbef7c565e6
font_01_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 10752 bytes
SHA-256: f76c7626f20b3f2f405974eb29e1672187100123db5aadb70d8b189e6e63abdd
font_02_sfnt_off00012fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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