Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2fe7d403756479…

MALICIOUS

PDF

104.8 KB Created: 2021-07-09 07:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 443c73bc5e9577d3302d321644aa6acf SHA-1: 77b2ab22f3cde499ed535c7637ed7363e4827333 SHA-256: ca2fe7d4037564797748057b386255e6502551aae5fbdd403bfc495782d77023
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=charles+somers+warbirds PDF link annotation
    • http://laboratoriologos.it/userfiles/files/mivegezesidokobifot.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/99189267768.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a377b012---sivuviro.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d821f04fe9---18242838462.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/322e697ffe1c664d50176c2cf41db166/12379441194.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3c2ec7fe---70485500737.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/72527987557.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1623392317.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/20320252470.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/la6f3lrg5dj73bfn8ln4udfmau/35167699332.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210620221735.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/36701407815.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e69e98c34---25488914041.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/fewonadujop.pdfIn PDF document text
    • http://sns.hu/_user/file/jazakutadofusu.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vonejelasavejinul.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7eace84af67f91cd9aea1836c332d3f2/8382648866.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a52141ba021---64409356695.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc38e5dd19---dorivusorazekadefafilaf.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6162225e42---653079440.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_off00013a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A23 10568 bytes
SHA-256: c58ea25c5711ff3bf45108baab9c53d9d38ea0d29534523effd6d2c6522a8d3c
font_01_sfnt_off00015244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15244 16836 bytes
SHA-256: fc2d8c99b89b21558103efabab675ac1caefc5a4552f8f000fa79a33d2089c4f
font_02_sfnt_off00017e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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