Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c83fd96a4b2dc41…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 07:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 43345bd01d888b6e88ad365404824f73 SHA-1: 08b827ae2eb81190e89c11f9ffa5998aa581fc13 SHA-256: 7c83fd96a4b2dc41d6eeff42995c83164d20da45842d3afdb3de48204f7a4189
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, as these techniques are often used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/abd8e29165661d41dd9e3e27fcc9231a/95880376938.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbaec10d34---99022629526.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ad60d2cf---govanotalu.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/56738672848.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/88922492343.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210902_B29EED2CD1A1F0B0.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/39351207643.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/mivotakoxaxojulolu.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/43133126906.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/pugomava.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/sugemavuxazivaju.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/kisawovudimo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5c3c51c9---72164609654.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317296b1f10---mevododesolajalafinu.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/varizegosatipupipiwir.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/57423501650.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/xufidawufonamosaxalitiw.pdfIn PDF document text
    • https://tch.lu/files/files/55322653817.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/8290819844.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/26432828679.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/jalipisinijamevajewegixa.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e191495649---58756694483.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/jurowirekitadaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pink+love+keyboard+app+downloadPDF 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
    • 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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 10616 bytes
SHA-256: 09a7dd431fa8699012de2340d00c0a78b272277317093435ce61cbc04d401214
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 17720 bytes
SHA-256: fbf6480f5846e339a4e1577fafbf01d2e1148ee5a18dc8e9a9456c36d3f78091

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