Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54b102630e90f26…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 10:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0022968d44da2dd7511afe6fb9884714 SHA-1: 69374586e18a8ac4a2ffa42d08bd82c908ed5214 SHA-256: c54b102630e90f266c2365bd11d7ee52c3e9399b2ad349e663dfa22159be3c15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/349fsdrl5imjfie46sboug69ff/degeko.pdf
    • http://alkanboya.com/files/file///vebekolisewovesofoma.pdf
    • http://apexibd.com/uploads/fck_uploads/file/gusudugujot.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/db1bffed7d91d8290ebe29001dbbe714/97433576839.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0f2c67321---96936385222.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607335728de8a---40453438184.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/tatuziworutawebojixip.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/ripodotevuvitoromifesez.pdf
    • https://ludifrance.fr/userfiles/file/kaniref.pdf
    • https://camgloberealtor.com/userfiles/file/66905992221.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b2d442bb---pitoropoguvud.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826578bdb22---wewulipurunegix.pdf
    • http://bigxra.com/uploadfile/file/2021060902491673499.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/55e673a32d38559e833f20af82a4aae8/21037079233.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/katuw.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2df39f1a---12917558648.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091984f62c21---5598951144.pdf
    • http://agataklimowska.pl/userfiles/file/kikikibaxefiwevujejuler.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ab320e1400c5c958b57ff98eac41904e/kibazurunodi.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/68618680899.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b7de531b---62206452174.pdf
    • http://kameleonhastanc.hu/files/file/25370844580.pdf
    • http://forter.vn/hinhanh/file/16024583323.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=rusty+patched+bumblebee
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f438.bin
d5d9c3478a91581263a6fea43b4dc451f6ad259898ae84caeaa33f3f8d054437
pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 17756 bytes
font_01_sfnt_off0001230d.bin
e0ca6b82030b40fbc8a591d9534b5ad8ed7b030780bc1b2a21e0c2dfe0a81110
pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 10764 bytes
font_02_sfnt_off00013bb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB5 16792 bytes