Malicious PDF — malware analysis report

Static analysis result for SHA-256 013fa38049d9280a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 22:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ddea56c4f43529e678f544f21733e1b4 SHA-1: 803706671a55fa309682f832ecaf27e34cf7b6e3 SHA-256: 013fa38049d9280a9ee2bf825419d155527cf1f3f1a056f260c0927e87732998
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content or phishing pages, leveraging SEO-manipulated terms in some URLs.

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://queure.ru/uplcv?utm_term=biology+practical+book+class+11+pdf+ncert PDF link annotation
    • http://iphysiology.ru/upload/jizojumowe.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/waterupulites.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/30688776980.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160accb24058f2---dikaj.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/ketigeximutedodif.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/74281072296.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202108200027578121.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/bbe37c1bd1f70fd6af4c4847b717dfdc/44219493247.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/89284731005.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/67825049910.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/9subp052pcm4om3nf456gvbs24/60607451326.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ce3bb3de0---28425954529.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/purabefizexuruwina.pdfIn PDF document text
    • http://gojjang.com/uploads/files/lewopaxegenokula.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/tuvawaxijoz.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/kozavilanada.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/18facd5cff1589da40e90a03c696a6e3/gutoroligewovaduvo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/07287af039c9494338d5a290f41c3397/mebedumawezumodabemasoti.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/331204bf9b83f849b5abbfe72cf75c34/89076849402.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/sibolefitop.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/be4fda98ff0e9e404b39a45b2916bda7/1231856999.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/28052022824.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/safonosamab.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/802aec0922538a64988183afd2c31a14/talubelomizikizotugijeto.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/tevagiwabeso.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_off0000c97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97A 11244 bytes
SHA-256: 3d3e4a816118422dd0d69fc0a32d4c9abc6479de748657216ada9692ad77eaad
font_01_sfnt_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 18060 bytes
SHA-256: edff891da6a1becf8d3e3c51082384c754c5dde88fda412a3f28a28c676ad282
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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