Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4ff41a6285f846…

MALICIOUS

PDF

87.3 KB Created: 2021-09-23 10:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 553c5bf39549f181cbc6b329ab9f2a75 SHA-1: ac3899bf8f8b4e499f77a696e900b37866e60550 SHA-256: 4e4ff41a6285f84638a14616618fffd7d7e5f8398da672b2b456cf1c02f34446
176 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and ML classifiers. It contains multiple external URIs, including one pointing to a raw IP address, and links to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF's structure and heuristic firings indicate it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d60c6709f---jorodizuvi.pdf In PDF document text
    • http://word.mn/uploads/assets/38898226420.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/pibabotuximo.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/5161062176.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/pelutegonegejinit.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630533131.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/dulakiwezelafuzi.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/41e025bcfba9a1454eaa86715e4789b3/lanodanipabazusodatu.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210901072517.pdfIn PDF document text
    • http://giahung.tincorner.com/uploads/files/bajamubal.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/fixezezevejiwoxebutu.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/lilenopa.pdfIn PDF document text
    • https://yifff.se/userfiles/file/vaxekofopazikufojokenerit.pdfIn PDF document text
    • http://p-energo.ru/content/file/jowaxoterufun.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/kozijokibojelutejugufujok.pdfPDF link annotation
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/sinewixalulus.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/lelexo.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/guxanumalosumolegav.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/xoligowozojadibukakarub.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/64456749283.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/9827862319.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/71448465557.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/nukalexowovor.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438d4f851a8---patepovotilitesiwabatisis.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/50bc93215708aaf0db275ed176a18534/72675680952.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/jamomaziragugerirasobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+android+bike+computer+appPDF 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_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 17180 bytes
SHA-256: 246966635b243ee001607ab3fc35b0a65ddd181064bd7891893e4496ba0d3072
font_01_sfnt_off00011dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 11016 bytes
SHA-256: a3e2d7b477024443c85ea3a311cf83992df9fb17a7af721cef005cb58b9da6dc

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