Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cc3b59dc0699c6…

MALICIOUS

PDF

114.1 KB Created: 2021-06-21 16:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 729816511c59342d80eb9657c5538be4 SHA-1: aeb1d51cd6a7ebcec1a08baac9dbc023b70e68c8 SHA-256: a7cc3b59dc0699c60f125073b5c79ac5fdce5558534cf8dc0e1f9944ab18e374
296 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing and social engineering attack. It employs a fake CAPTCHA or human verification prompt, combined with a lure for recovery secrets or private keys, to deceive users. The document also contains numerous embedded URLs pointing to potentially compromised CMS upload storage, suggesting it may be part of a larger phishing infrastructure designed to harvest credentials or sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 9

  • 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.
  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://tablica-nieruchomosci.pl/uploades/fckeditorfile/vidoga.pdf In PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69505b393c---woxusimimizam.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/dozijenaviguvow.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/jebododagivozebive.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/1084925211.pdfIn PDF document text
    • http://roocenter.ru/upload/file/45146142321.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5f0656b6---ruvolarevoneragixux.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/517a4b5ce19b590583540fe71c4d613d/xuvuboket.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e760f65bb01de35e7927e9caabd56c7f/boworetelijukejota.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3ffd5a04c2d3a7d5c47f4e0578573d10/fuzosavatojekapu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607912e609251---9105372933.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dda4ff631b274e0327ec30fd7ea11d49/lajiso.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cca7278114.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cde3b585dc046f9564ede6a3a4ff96b9/wemubopivivixiritopij.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c3677b4f---89983201233.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/ripegalovo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7d032227b5839a1f32c36db9a7ef6cc5/vitabowipi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d59a112e3---kegejisubilobumafego.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/xifigatutomuzomejevigeke.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/46855712344.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=top+free+stressersPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15375 6656 bytes
SHA-256: ddebf461d9343d02325567dfac06ee035c710044b35897afbeaa1fba24900471
font_01_sfnt_off00016427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16427 4604 bytes
SHA-256: 182b6ffe452e0c405ed29464843595cbe752f88ac53cb0425ed4480c76dbd7bd
font_02_sfnt_off000173e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E2 15988 bytes
SHA-256: cc4d6fe98351966a06223fa063a43ed8912a29f8731065e2cd784fd21166c982
font_03_sfnt_off0001a4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F2 16288 bytes
SHA-256: 20279c95472b0a260e5dc511d5029cbd561770a605fe62825b41ef2e2f3750a4

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