Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a01436e34bfb32…

MALICIOUS

PDF

76.4 KB Created: 2021-10-05 03:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: be74798e32ac5707c2e31b7c12a23dd8 SHA-1: 70aded0c1f029e5260d6ccb14eed09519a0a7dbb SHA-256: b0a01436e34bfb32ede6969d4e02489bf50f59b96168af76a30645ef557343b8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains identified as disposable or compromised, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on potentially compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://trompis-tondschungel.de/userfiles/file/dazukeweniwokinisuzuwos.pdf In PDF document text
    • https://amrapalispot.com/userfiles/file/15165152914.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/59276933626.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4db8b44a21799d05d3bdf02138c9edd5/gimiwereb.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/lamejifa.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210911002430.pdfIn PDF document text
    • https://btegypt.com/file/71939545029.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/83239003231.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/81201561593.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/24553893885.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/kesibes.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/zofujifojowifutuzi.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210927161818.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/vunirinozufagufesowojugow.pdfIn PDF document text
    • https://shidoremicrosys.com/media/lidaj.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/35207981795.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614033d06d4d5---1403716995.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/gaxijomoxadigegabijote.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f024bac191bbee71ec9a7ce9717137c3/23396345712.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/41742806863.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/5306695874.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/24578805062.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/8shlqk74f4oiie7oc7cbm3287k/mesusivo.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kupuruvejumibusoxi.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/laruvosasibojejosiwiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+many+liters+in+1+gramPDF 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_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 10692 bytes
SHA-256: f9fa20793eb766d355f001346f7548f549913b131599f820bea7a8360baae455
font_01_sfnt_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 18564 bytes
SHA-256: e4306290d35b6114a55354122f0dabd7cc37ec1e0b00a2b0af22e9374166f402
font_02_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1