Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41695c5b15943e3…

MALICIOUS

PDF

140.6 KB Created: 2021-06-12 22:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e0106192313d8a3bea944b0f71d68323 SHA-1: 99a84f4d7b4493c3724b53f8a9d738877d3777a9 SHA-256: b41695c5b15943e3d9004bd53df2b783d6d23990d67219bfbc9d8881c9f41b39
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of 'utm_term' in one of the URLs suggests an attempt to track user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=waqia+e+karbala+pdf PDF link annotation
    • http://vitanova-cattery.com/upload/file/15313145629.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/oh3dbeo6qonj2p5b30m82m4fs4/rototetipumajudobasi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cfc58137---37969511522.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0hkrhddcrjc7mlqjadjfheuon7/jojesetexowusuxi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab614177c6d---93221079841.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9513a5114---mevomerijorav.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94542886b---42802660559.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/rewazopifodegim.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/dd3b01e7bde78e410deb25d74a586be5/xagifasaruxuleg.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ef212b00---96372682348.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082155db61d6---14636254166.pdfIn PDF document text
    • https://airbays.com/userfiles/file/11270045438.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/39155675797.pdfIn PDF document text
    • http://jarosi.hu/files/file/31055060729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0001ccd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCD1 5200 bytes
SHA-256: a73f4c0a28a8622566e3238f1246bc34c931cecd50de3fc480b7116f04c4e5ad
font_01_sfnt_off0001de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE9C 14060 bytes
SHA-256: 31c2a2ccd6c0fa6402a62cad7be5be7731c9a3dac6d06d8b4a46b6c65e7cdada
font_02_sfnt_off00020a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A9B 17108 bytes
SHA-256: ec54382e80610acc87bbc40837113b8691ee1cd389cc4155b4c1572310830856