Malicious PDF — malware analysis report

Static analysis result for SHA-256 590e12a4f8ed27f5…

MALICIOUS

PDF

71.9 KB Created: 2021-09-15 23:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d210a2dd42a049dc578dfff948c84736 SHA-1: 7f23464cf751f57aec9cf1a46cf169293ff9af03 SHA-256: 590e12a4f8ed27f51b4f8b215037c500a0ee6e6899e6ef9c195e7a813ec03c6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

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 https://krisoc.ru/uplcv?utm_term=wordly+wise+3000+book+9+lesson+6+answer+key PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613327cb3bdf3---remikuliwasiwok.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_18_53_11_8134.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/nasolebitekofa.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/57748431798.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/tosowunabigi.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/zedevonemi.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/96929558005.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d62a44beb---7815391083.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/xamafofojadazefofuvijig.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/likig.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/tapokikoxa.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/40910732281.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161332e47b2625---divuwerigovixavulolo.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/95000261816.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/71647007831.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/zirozugetirewoguvota.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/u3kdfvb4qv9oqhgotg8t91srlk/ramevakolonozije.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0fcca7b2c---zodugoxukot.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/84617024141.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/58287116091.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/pufexizudujuxowopupuna.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/22525826925.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_off0000b931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB931 11200 bytes
SHA-256: 47cc9950bc0720a7e64d2b76914b6b0c3ab31c7c67dc689ccd74fa80878beb7e
font_01_sfnt_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 15028 bytes
SHA-256: f0244f8f801f28f7c73a2781f2095ce30b3037e7fa41300169a034735abdb747
font_02_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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