Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a5a58190959419…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 16:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e052446b4abadd926ad05aa9497402b SHA-1: 22716a6013df581a6102416930060285c2dc34d6 SHA-256: d1a5a58190959419ec2c5090b09e7b0fcc3fc8f094b2f206748b094c49fa3cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kfk-dekoration.dk/images/uploadedimages/file/xemabideniso.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/75888d57bb19552517b275f561e0f97a/46738190446.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090502561714442.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/xojetofupo.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/muxuxa.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_FF13DF893D1BDCDC.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/marape.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/27372529987.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/bekimodavizimipa.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/tivesuwovusitikazes.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/59199286928.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/22610153435.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zoxaxowuladapute.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/49993527880.pdfIn PDF document text
    • http://szjg.hu/images/file/10047557642.pdfIn PDF document text
    • https://cecprint.com/images/file/46946421654.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/02bdc01d84f41f0297476a0e38b44b45/7905916892.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/bujibam.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/82058920373.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/24712439694.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/xisodefatamefegavixoviwiv.pdfIn PDF document text
    • http://grotech.in/userfiles/file/14540601662.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132182cdedb6---wixazevadijabajanub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=difference+between+constructivism+and+social+constructivismPDF 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_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 18692 bytes
SHA-256: d195ed7ddbfb9bff5707f87e7c01ec5c3d08dfc29caa5a11689570814b0ac373
font_01_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 11032 bytes
SHA-256: 8c30887efb8594d1870b1001c9922e72d7b5315f1e2fa7ca3f2d086423c1e920