Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24ea5b2befa9b49…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 15:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c463f038fa48a19c15f289b215859658 SHA-1: 328e2fe334157b85979f4d0754bb76378b5a1539 SHA-256: e24ea5b2befa9b49db4d94913905d62bd20cb9d759594f4b1ac8812db831a64e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=french+braid+pigtails PDF link annotation
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda88b7e16---mejivujakipazusalibexo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607277f102462---razutewala.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/89547452197.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/magofudobu.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/37712492879.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/dololuzutizefusewajavi.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/xegepu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2ada3b5a481d6d5aa872925383ff6931/dumak.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a30427cafe6---40371455106.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/bizuten.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/ganukomowusazomiditapibin.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/zesovifidiririv.pdfIn PDF document text
    • http://standardamulet.com/files/files/gitififafetofowunim.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/tobebalupelexuviminej.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/6967108082.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160be7b4d4e41b---tevokikid.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/miragasotaxivozenoxumolo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/58782728611.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/99432692302.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/712764bca06dc7831e46ffd9dc2a728f/woxap.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/24142294595.pdfIn PDF document text
    • https://isosklo.cz/uploads/63530431617.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/lomopesamorod.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/vefoxonebop.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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 18460 bytes
SHA-256: f71e3dc83f3e698b0a041c7c67c4a946ad89504e92b1949f692cc2ec241d6545
font_01_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 10788 bytes
SHA-256: c1fcfd74d520e1b89d903edff740e46d47c459aaf28988efca2fedf96c05e732
font_02_sfnt_off00012872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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