Malicious PDF — malware analysis report

Static analysis result for SHA-256 034d66f701e11330…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 13:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eca108eb20d9d4688979e342528c55ae SHA-1: ef077899f2dc5a903cac7789f09951d06e33df05 SHA-256: 034d66f701e11330756c88c0931ef5b1c475f06be2edee233e33e5e637184e2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by directing users to malicious content. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94f69fff2---gezaxumobadetugonuj.pdf In PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/61260549189.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/463d7ba0425edc090b2dbbb21c17f2f1/76629758909.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/dowivuligejuj.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3633c73301e71e7c784fe2d276eb4846/84223468398.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/dowukozup.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37bf715b0---numovu.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/kadurije.pdfIn PDF document text
    • http://acril.ru/ufiles/files/gojipajofutufuxe.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a625bcc7fa9---22056815686.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/ravorirezewuvaze.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/rumezezefigeb.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/vuxamifeferi.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/46894804482.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fisofebagizefiren.pdfIn PDF document text
    • https://gilbertems.com/videos/file/raruwap.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607417f898ec2---wolovatubalotop.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/45640627654.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/370670063d4255bcfe9f50b1e2402b30/nosexemilugajepevimanije.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/77930123101.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2095ec30b8---85601239916.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/64255082752.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/68613750350.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/kizida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+are+the+duties+and+obligations+of+citizensPDF 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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 18632 bytes
SHA-256: efca31be12b0847d351682a60e5e7353bf25b4e5f730eec0a8d3c30bd417f1b6
font_02_sfnt_off000130f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 11048 bytes
SHA-256: 8eef444cf8f352528231bbd50a7119161565c6c7f2fa3d6c02a32b96eb944111

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