Malicious PDF — malware analysis report

Static analysis result for SHA-256 5874f47338f65307…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 22:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54dfb36d247c3bf2e3adc81d7f5a7d84 SHA-1: 62189aea902d1455dd2c3f277edeef16533e8811 SHA-256: 5874f47338f653077adfa1a62f20c60a2c69b9a64b5e859187cb09d0cf739b45
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 numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=fancy+pants+adventure+world+3 PDF link annotation
    • https://sanvexe.vn/webroot/img/files/88394787967.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/tilozorajawodemexo.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/61446788639.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/28052631468.pdfIn PDF document text
    • http://xsjprinter.com/d/files/90842570357.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/68834490911.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/fuxazevepuvoxozegekus.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161433a87218b6---13198367756.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/97143019086.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/sexolexepes.pdfIn PDF document text
    • http://dasbluemchen.com/5493954206.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/96727123848.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/98363678252.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109061037522376.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/97407321800.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/98614732783.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/65408683774.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f13f37b3af---93536939306.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/rulikax.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144363f46d48.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/rineromu.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/78426394003.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/54579630485.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c0b995e9e---dukerosomejurun.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/58476378547.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_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 10928 bytes
SHA-256: 64fda2ca8ba2af4163d4c33beea2a7018b84ee29c4878fe682d94fa481b7858c
font_01_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 17560 bytes
SHA-256: 6b9435f69f5b88b24103b15b0925387e6f9a8a94a5bc83ede81b19a74e252ba2
font_02_sfnt_off0001158a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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