Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0350dc2657711c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 00:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94865ed89af8ce0791651716393b2344 SHA-1: 6cfa8bcfe77c3434b77f22cf99a7ea85effa5d63 SHA-256: ae0350dc2657711cef1ff5be4810abd6503559d07472d6dcb9cd9713e4ca3f46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://watthaistuttgart.de/userfiles/file/fomigamexubabofufis.pdf In PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c34db4bf901---radisunu.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/kegunupiwinixezarenofije.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f43d459fd2---pibomokidis.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/92156177377.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/12er8f7rdqbi1ge3lplqlckiuu/66051853762.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118a95feb9c4---lekowunikudorazotogegelu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8802dc2b7b---93736208996.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/19828307346.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0ce2f250---vufajanigugodudupipunu.pdfIn PDF document text
    • http://kasargod.net/uploads/file/46528065694.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/jaxatexiratezajepide.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/4432948808.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c16bf55094b0fd8bb27148a4e385b9b1/91295146645.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/sulosujekonigeno.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/69401607316.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/fojenuladavojajujot.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1micte4k3d5tg4pf4p7b2ob3r1/51599052492.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/k16nudgpcec5unqmqqc91d4g76/99169942629.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/88603936966.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/14011541270.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/dawejixanewopetorova.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/69126582626.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1612d31b8b521a---jonevezafipipinagukonig.pdfIn PDF document text
    • http://babamoleskine.com/files/file/50300721265.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/dukuvoleturerozojajemiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=article+review+sample+pdfPDF link annotation
    • 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_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10688 bytes
SHA-256: 0ff876722f22190ba354416c8b7ecf80b6fbd18ed914b7af5f9f4b864d0feaae
font_02_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 17672 bytes
SHA-256: 1149397fc3ddcd9f3303825eacb4af91baf2d9208e5f837dd36b19ae8ff38387

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