Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31477e4010d4e29…

MALICIOUS

PDF

92.0 KB Created: 2021-07-30 06:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c8e161c6795071658f894a2e908626af SHA-1: ac1549188261d6b2ac605602fab9f4651a8d74b9 SHA-256: e31477e4010d4e29f875a1cab3fa1f45329e5f714fd9acc45c2c07132856f6ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm hosted on compromised CMS upload storage, with numerous links to unknown PDF files. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a70b91412---85930136597.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de01f60c7a3---buvulepewawu.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/10894148762.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hhivebkgn2oihscmejh3f5dh59/koriw.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/54249714463.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2c6fdba23---25130439550.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/31527471827.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/aa9ad096d5d700b91d714d106bf34ffe/porebusuni.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/lijifobalodesujetafobokos.pdfIn PDF document text
    • https://filetorme.com/upload/files/lokilavezofudum.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/83945220393.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5baf4dd861bcf6f9a8e6457c66094111/49888668248.pdfIn PDF document text
    • https://digireg.it/upload/40563106486.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/64218726235.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160704f9eae85c---zemisuzoraw.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a75b1bd2170---jimajazazewa.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8lg6fvlf5ff87p75tkrh01grkd/dadomaforalip.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c5l03urfi28pdptf267clf4c40/zokivi.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/78707074336.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210627224818664903m1sko2.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tajizeroguxelib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+plot+of+the+story+the+ant+and+the+grasshopperPDF 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_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 17096 bytes
SHA-256: 84f79f2b47e0a0352abe56ec3d1f91a463df282ce4eda1d14af0e41274b24d28
font_01_sfnt_off000130dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F4 10884 bytes
SHA-256: 03a5f2460eeb2fa4b00890b98249c544fc9a6a99d6d011b229e50f0d6cee2e00

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