Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4f98514fba4a8e…

MALICIOUS

PDF

78.3 KB Created: 2021-08-18 17:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 076398b4b3b2559272d2d2c771d4b987 SHA-1: b895e53ef312e2630c6db445248971a6533c2537 SHA-256: df4f98514fba4a8e9cfc9cf1c8800de4ee332eafaf1b89edad754ac2c6b32e0a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous PDF documents hosted on various websites, some of which appear to be compromised CMS uploads. The presence of external URIs and link farm patterns suggests an attempt to direct users to potentially malicious content, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sujitonweb.com/userfiles/files/renagusezojojinuk.pdf In PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/mizutolajaxo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608493c27b3d1---91647649004.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080029888adc---11716360612.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/53796350498.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/56930327444.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/nokolawepetogojibovil.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/2ac4651ce4cc82e82e74ea43f680119a/25639150175.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/paxudimigixewa.pdfIn PDF document text
    • http://foodchemsino.com/d/files/xupemaguvupugoketumoluka.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/51739210920.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c746a105a75db58eaa15b9c6bf8aaca0/zenesivojepusifedidur.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/85852585061.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/8d359ac878b30e067272b8c52c52a7cb/66024460833.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/32efc0a9a142ab57c1fc964251ce2bc0/50489327955.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/71487732121.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/vurutebakupilorozikurex.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/33166338025.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/82096045401.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/63896675011.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/32vmqkoodq6l1q627v4uc1jvg3/ninoxusetumabawutiroxulag.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6a16c4c2---58104577967.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abdded7c153---4494531985.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef215d276---suwudavije.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/bolijiju.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/jilibijavum.pdfIn PDF document text
    • http://nessium.net/userfiles/file/83394964483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cheque+payment+voucher+format+pdfPDF 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_off0000cd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 11036 bytes
SHA-256: db02dd06c6442c218f6c612307abe6f97533a3251752a2bdbd42a31bf782d7d0
font_02_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 16956 bytes
SHA-256: f53c37f5fff22029da3ed3bd0fd810c019eab0953f2f44ad2384b9e43eebc551

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