Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7a4f551b09e628…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 09:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 928e5bc51f0b824bc481f212db90d20b SHA-1: 1ed092c15a590a3ff99d5b6e891f337012d40a1c SHA-256: 5e7a4f551b09e628997b510fdc7861cc66c29535408ba7e3b0c2e37044c69ca4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. It contains numerous links to external websites, many of which appear to be compromised WordPress installations hosting PDF files, suggesting a link farm or phishing distribution network. The presence of a 'download button' lure further supports the phishing or scam pretext. No scripts were extracted, but the overall structure and URL patterns indicate a phishing attempt to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=download+nfs+carbon+pc+full+version+free PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/91rh1vkbrq211o212qdv3tfj43/remuj.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/2a684317dae62c062ebeddd7d0c12da7/11289712600.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/47387b2ed4684e41469924e66b94788e/71916190755.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c38777d3---bixisuboxasub.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e40d1dcb---86707663517.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210530133305.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/vuvinuvopexosesigore.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/lebutitibolekoloji.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/mojeni.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/58fvsckn8ej9ppmn6rn007sd1pfr70es/99684818463.pdfIn PDF document text
    • http://www.celso.org/download/99802020511.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a03391596c5---65182037838.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/lofud.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/nerotetebi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c7ee0fc21---9908026658.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/e5mm4ufult97nu5plraghaff6p/zaronisorolipezujedum.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/33201034292.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc097aaf9---68060061635.pdfIn PDF document text
    • http://springbook.no/files/zefopiduwuromonedepe.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/57121lp454u94a6l8a4gfrded7/33004069088.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/xijotutepimalitewutuz.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/11923168492.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f127a6261d---9537141938.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/80641f8422f2f5b21fb825b329309999/sudutapa.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_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 18856 bytes
SHA-256: 0d72a74160e3d15d472444b34c398dd20397d4ee5cbd05af4379e02edd64326e
font_02_sfnt_off00013925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13925 10908 bytes
SHA-256: 8074cb66e774d414c147538b5228d120893a098f2d1fc11b945c5bb46fe236d9

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