Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e05f16977952400…

MALICIOUS

PDF

81.8 KB Created: 2021-08-16 01:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1b1db6bf8ce096211c0ef86b38f81f94 SHA-1: 546a79952ac28d3dcdd8493c75decdceed4b02f5 SHA-256: 7e05f169779524006566416e667e0fd0fb64196ff2a2f459956da3aa23dd1856
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to potentially compromised websites or disposable hosting, likely to lure users into phishing scams or download further malware. The presence of multiple distinct hosts and UTM parameters suggests an effort to obscure the ultimate destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://smidgel.ru/uplcv?utm_term=whirlpool+cabrio+washer+f5+e3+code PDF link annotation
    • https://ivanda-commerce.hr/userfiles/file/kudufebimaravavanekizimaf.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608099938e5e0---kabosapigojulo.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/40987810919.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071b69b2d87d---kowovog.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/jipukofumirejumamejuv.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fd80a14573f909f3836fbee17d6e07bb/21495165039.pdfIn PDF document text
    • http://lblussana.it/images/file/91786748985.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4c0e1b3dea93740486d3b31b86928231/simuzitaviwigigofazip.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081ebfe130fc---23651826675.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972457ca496---21471367772.pdfIn PDF document text
    • https://mszukam.pl/dat//file/pivimig.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160705b8e846d4---renope.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d209d9296---bazobi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/84ebd246283b63d2a21f3998f12881d5/2984276146.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3a4272mvockn26c7v3f7teas5n/fawoliwoduvalopozebakiba.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/aa26756bbc1d917d90ddb3e8f1c9f3a0/tatagamowelafarese.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c513330ad30ad11abc7dfaaa00a3ef64/29905220426.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d9f877e3021872490ac76a9394fd6787/92333608212.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f74cefa2---59758362786.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/465caefdc4939c6b1a1cb949a90b3c66/mupidijemanavovew.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d9f49436a8ba750cf1239d9517bba4da/bedodadusutuba.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/78307051900.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f7c0e806e---99723581648.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/26993069016.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071f8be56f80---28707439930.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/62183047818.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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 11040 bytes
SHA-256: 0a5ed2ed8d4dc12d650951e390f2d790e76a5b951c73a4868254bc51ee0e015c
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 16800 bytes
SHA-256: 19e768dc427526d0e5e5cfdef35385a5c692cf8fe0795d49c7f4976a77d55f64
font_02_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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