Malicious PDF — malware analysis report

Static analysis result for SHA-256 957cf5a1690eace9…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 14:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11f813aa0d19dc2306bea40e4332a1ef SHA-1: 74e0fd6cdf35fdd9533f1d20f16a7880b747a402 SHA-256: 957cf5a1690eace925eaf6604b18e9e763ca37d06277807ba8824e16d46c7048
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, containing numerous links to external resources, some hosted on compromised websites. The presence of a 'download button' heuristic and the ML classifier's high confidence score suggest a malicious intent to trick users into downloading further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs strongly indicate a phishing campaign designed to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=spider+man+2018+apk+download PDF link annotation
    • https://coffeetuanvang.com/Images_upload/files/duxowubatowaxunupevegobu.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/batufuwasatov.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/12804243789.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/85e6ef0be960827f59a4dfff043deb7e/82643564105.pdfIn PDF document text
    • http://soupworld.de/upload/file/wunorukoweleje.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/71032060107.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/703af458afa163a6c051007cd9775d89/27197183363.pdfIn PDF document text
    • http://web5gstore.com/Files/files/zimulesasowigibumegub.pdfIn PDF document text
    • https://kermanrooz.com/img/files/sawaduna.pdfIn PDF document text
    • http://kvrhousing.com/uploads/45264329327.pdfIn PDF document text
    • http://retailcop.ca/files/37473718330.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dd852b616076d85adeddebe1f19b7cb6/53305467679.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tanad.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/12149485773.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/44725585436.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/277957759.pdfIn PDF document text
    • http://rayanchem.com/d/files/bazomemezitogararaxi.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/29896660501.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0e821b27b---xanibosero.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/506g9ned0rto531b27fpqivf3p/tifujulijetefesazaji.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/75077636525.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/41741059408.pdfIn PDF document text
    • http://kodemari.info/data/files/gitisenura.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_off0000ae7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 15016 bytes
SHA-256: 055ebc5444a543cde3fe1093d5bf836b4213bf5d0f52a108ef632a96ebcd83c8
font_01_sfnt_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 11040 bytes
SHA-256: 1ced3da718d9ded810568b2b35cdb69435a23c51d8afea347a44f42f6debc897

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