Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e141b0726ab8e98…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 04:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a19b3e5e3d913f82cf7ce7030cc75ad SHA-1: 1e9b3387d7f37d45c61592908ad260160ec447d4 SHA-256: 9e141b0726ab8e98a012a365539224a75d48ce9cb6bb2d687a5378e0e8ba49ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=cubes+and+cube+roots+worksheet PDF link annotation
    • http://cortabellanews.com/userimages/vunojomefedazibog.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ft619fik2l22g7lgks6jopig3m/gulijulit.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b5b85fc2aaa7497bace91a166c021873/weguvijujuwavetur.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/g37jc0rd6cv3erbnm7u18asdkj/polipijimudas.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/30248866176.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/jonedikozu.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/86913328003.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ef7bab55af7aec024b043a1891fbbcbd/46945929572.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/16621401816.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/96480782478.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/56a60d2405c5131cd03dc23258d3aae5/pinilebabeviwod.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0eb03f66e---37728826505.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/buzuwitev.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fde6aaf32e1---romalejepeliwuvozagopu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160881b6cf13c5---93358523464.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/11464124101.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/raniwibegafewaworakipumu.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021070411103436.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9f0b7ad5d97549a6dc2b830e3187274f/5315095158.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210824132214.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/34333621819.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4e441c92c36b8aa5465d991b1c2ccc0a/diwegiwinobuwogezox.pdfIn PDF document text
    • https://kuepancong.com/contents//files/lamaberemof.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8a37308f596c6f5141e274ad92df147e/bizofaxopojovevo.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_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 17556 bytes
SHA-256: a078f3cbd0d51edae87c18972763315a4719373c6862140dae168b975d5ae81e
font_01_sfnt_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 10776 bytes
SHA-256: 297872852a3ea996b98093c0e36304317a2cc3695edcd77cad5986c556c21f00

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