Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c040fdd1863c96…

MALICIOUS

PDF

93.8 KB Created: 2021-07-12 22:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0216b8bddc60e1c6079474c47f1a3c33 SHA-1: ecec18969c811b255bd06ff5428f77cb9b76834c SHA-256: 06c040fdd1863c966dc7c384b72aff8769e25bf407bebdd4298cb85e3d89e0cb
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The presence of multiple distinct hosts and a link farm pattern indicates an attempt to distribute malicious content or traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b7a1d559b720740849b5d65ab3968b31/zozozukuzo.pdf In PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/36e9571d8faa57e4c318f91105c4d504/71859563917.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/gukevof.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9de14fba6d6da6e33a04bd256bd9c02a/rivelotomalopoj.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/80988217330.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9a6ce45fdbf583ea8813ec0bba6cd5c8/zasiwawexutesubonoseb.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c4264c940---79734113576.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d4359728---58811088758.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/buwudija.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/dodejowizagaw.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f218dc1d5b6c96fc11515e6bb9e98504/38017907050.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/wujoruxinepopujimip.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d8103be9589a5753fad1e78c8cc4b85b/kudububarovolofezufil.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/gkj9rt4e51t4590s25mfa4ii00/44243708362.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/37511227329.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f77aeb4b---83343856185.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2e9e008c---18253916944.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9f6b68bd7a3adf15b911f653c1c762cd/xizibujuzusategofisofi.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/omkbjoekcquj01e50e6aimvrh0/vovevegogemixaxakudev.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e88a4aeb---49190130456.pdfIn PDF document text
    • http://erex.hu/upload/file/dobitabugu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160befdd676dd7---suzenitat.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5900ba32dc0701fa083f2e589461aa58/jabaxufemaso.pdfIn PDF document text
    • http://hanifeugur.com/image/files/14600717271.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3780e503f---33441592171.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608125c66dfea---46838458669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=speech+on+books+are+better+than+moviesPDF 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_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 17620 bytes
SHA-256: 4c9c75755c6efee2cd37e6a79081411e9100de81f2fd1614ac15024baaabd355
font_01_sfnt_off00013851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15068 10968 bytes
SHA-256: fab3c9fb31fc0db07783b75c47cfe4b4354444bb2eac7bd3f1c986623b17d102