Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f81fd2e01d9962…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 00:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e2cdeaadbdd6de272741c5c3c26cbc5 SHA-1: a64407796c77cbec2b20c978b2ac9064c41ed39c SHA-256: e9f81fd2e01d9962b6dc6bf9faf9deaefde42e437db3eb8c795bd70fb9b59c38
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to disposable hosting and compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=cg+movie+i+love+you PDF link annotation
    • https://bilegt.mn/userfiles/files/bububebipeso.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/povabozatetu.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/34817511610.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/32924980943.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/zorewij.pdfIn PDF document text
    • http://www.moyekolodin.com/files/69004463106.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/tudizaluno.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/90610623048.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/zepixuvodu.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/21280956646.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///34367089808.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/divipaxuluniwizawex.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/puxuwipubugovonifik.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b0b132badbfd10c5015384c9b0950c70/xazimikegebetamakujuw.pdfIn PDF document text
    • http://velisend.ru/photos/file/43918550652.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/87929928308.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/90697764707.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/56406635323.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c9b0913b---revewiruba.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/67822314209.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexibobitukurizubumodag.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c0b18e0ce1552b20b25c312bf916102f/4380333169.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210921065350_g5w7j4.pdfIn PDF document text
    • https://ghnservizi.com/file/kibedijo.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/21268383267.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_off0000affa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFA 10132 bytes
SHA-256: 0e29ec0a58acfa4ccf5ecba06a1e91169182b52cd1601a231fc55eb36b22dfdb
font_01_sfnt_off0000c6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A1 14784 bytes
SHA-256: fcd58676ddcd157995cf20b1814350ad595d78a668de51582acf98f127ce9fad
font_02_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1