Malicious PDF — malware analysis report

Static analysis result for SHA-256 b723dd626a9c4cd1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 08:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4324e2a50962890f3f9524a5b26b2ec SHA-1: 540fa6657170bcca3498294f0b43a45a940e629a SHA-256: b723dd626a9c4cd1cb567bc2747eddb53368fc33b51eecf70e13429f20d26e18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to URLs hosted on compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=autonomous+desk+user+manual PDF link annotation
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f2022dde4---73225490749.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/vofop.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/68033465669.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/wobiz.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/vitazagapede.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/xuzulinomod.pdfIn PDF document text
    • https://sy-tech.eu/file/18980439134.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/43904559548.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/powubujopibozapiwagifawi.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/18841913979.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/mezekulupavevijugax.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/xibinawawob.pdfIn PDF document text
    • http://ridendo.cz/files/file/govebazazipiwidomabiwip.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0dd6a20821351a7002ee2226e0c6ae47/60090572708.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/50470153888.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/31101769819.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/82939003907.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/6304962062.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/24545251257.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/xulunutulipi.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/83330456121.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/25420996193.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/numuva.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b334f3bde---rosot.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/95777238040.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/geluwajopajafab.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_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 10488 bytes
SHA-256: a96226278a7c3d768e81b3cb5c4adc120a3c008d4021b0f352bac740f218d6bb
font_01_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 18224 bytes
SHA-256: 5df6fbbfad73b10bb4f93a269cbaa203283e58c6680edcf5dfdb699952dbd092
font_02_sfnt_off0001221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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