Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfad5ac8d184ba66…

MALICIOUS

PDF

78.5 KB Created: 2021-08-25 17:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1003345106ffcb2e6dfd669683a502b8 SHA-1: f98aa820ad7058c23b874fac8f96bd2ac0d22f91 SHA-256: dfad5ac8d184ba66d2494031e27c086a6886fcc34136e311eb4e4628791a8c4b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=one+day+i+fly+away+randy+crawford PDF link annotation
    • https://lasanisports.com/files/tifivukomunipabu.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/19169213088.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/668uif6v38o7qq6eiqpbbuchos/60050160829.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/770ea004ea75f2153396efb9265e97b3/66025781780.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ke011h1ifmpfiqsi6hdo2gdqn/luvudarufivuvedajor.pdfIn PDF document text
    • http://rayanchem.com/d/files/xomuzezu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ab7a6e54b4feb35558026eb858b659aa/76253253886.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/11149651084.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb7ad6a58---73695608804.pdfIn PDF document text
    • http://360mart.net/uploads/files/fudinudeleronagizugetijor.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/rasibenazerorimowuzosube.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6e07bac6edc6e74562c25662935a95ca/77115770340.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/89148479932.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/varuni.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f1b10c753396474a62ef17124bb1970/xuzenedirimerufaroz.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/j9eujti4lkjls8ldhab9l0e4r2/gopoz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/76cafec1b9739112b3ca2a06223ff38e/wuwonikowinuxezisifokip.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/74259037598.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o6hlaofusr5opehhjgrcdsfe84/gorej.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/40334041611.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/79545788874.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac52a96b690---19346077679.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/65689931088.pdfIn PDF document text
    • http://zerosquareonline.com/file/3905711594.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/865dc5976088638e927139682eb7d1e0/sizuxivolopevudizijo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/o8mum78gaa12l6rfceib94nuks/7060477140.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_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 10428 bytes
SHA-256: 3b4acad5edb7cc7d8d295f77fe86e0e3ea2808a8c057c1ec3b0e2feb1c8a3063
font_01_sfnt_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 17304 bytes
SHA-256: 0ffc8a20f1ff362d15d1b2db5506f7b6326dcff511d5512af2660f86f57f17e2
font_02_sfnt_off0001146a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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