Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a981b7be091dce…

MALICIOUS

PDF

92.4 KB Created: 2021-09-05 09:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9c1482662586ff7365494e741d9b41a SHA-1: 391fde1b47cf60683d8e380f3b34e28bb73c2709 SHA-256: 98a981b7be091dcee294735b02f360b2d03e228e6c74a1b789374257a991264b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious content. The presence of external URIs and a link farm suggests the document's primary purpose is to facilitate access to these external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078410ea0d18---zuzujabojenuvu.pdf In PDF document text
    • http://hodinovysoused.cz/upload/file/medewixabufega.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bq6llbgvgd55gfh66ls5162ga7/lebuz.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d993052513fcf29e1451dd30e32a2991/zonekoxezigira.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/bijilixedujukunisezam.pdfIn PDF document text
    • https://jagominum.com/contents//files/905463305.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/2oj14v9bp5l5119impocd9he22/vunavijotusovujadur.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d9c07f6535e29df81dde07a0680f56ce/74166805041.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a91d98b60f25436ecd0301e066f75126/temerevej.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1cfc43060bdea830ffd18ae003129733/12167024612.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/63959054211.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b63b92748---36286639739.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/gavaxifamimukemekepegaget.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/12115453980.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812db72470e---79983852813.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/nogotipe.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/23957170593.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b23732d6b6c---22908601994.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59251b33d---88230965467.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/490dde1d2e7271aebeeec5c43422bccc/welozifusagagajajasu.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/pagoxipidenujojevewenugad.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/vo8oe3oh04meoad6bs69tpp6mh/15243347222.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/gututirefakudidajirunu.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab58c6d8d---nuzirilazonisibabed.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbaa7659d---bebabinagu.pdfIn PDF document text
    • http://caramelitos.sk/files/migewanezubuwepikiwaxu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/8nt6bglrusame9k2ejhq0aglb4/25906340045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chromosomal+basis+of+inheritance+notes+pdfPDF 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_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 11056 bytes
SHA-256: 9822e4fb68b583a2a03638f28d777a0dc69c3f82f518b13895b4b0e61b79b17b
font_01_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 18668 bytes
SHA-256: 20a78feec404ed0b62ba7d46dcb4fdaf3308eb8b6e94b513e8d6ba8989676eeb
font_02_sfnt_off00014b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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