Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93a121fea840fb5…

MALICIOUS

PDF

73.6 KB Created: 2021-07-04 01:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7cd69bd2a924cfda588f211bfa3aed5 SHA-1: 8264f94af165a5852821540d5bc31ee7a61c9864 SHA-256: f93a121fea840fb5a50f3c30ed9f6dac5a3fd67c1bea1595fa60dd1251cdde87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests the primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=bissell+1655+manual
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/bb4ecfebc6fb5d8a32c79b72997299e5/xodinorenewozumed.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160996b9a6e1a8---badiduvimexo.pdf
    • http://xn--e42bt3l.net/upfile/files/gogisenonexal.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d765594f1---nitagizu.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/tmsl3h6cq6705d2omun4q48vt2/wovoruzewo.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0031abdaec---sowijuxoxogezesage.pdf
    • http://axiomestates.com/userfiles/file/23319131014.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9fa044df48630bf0d013dd6f55f9e75e/zarikojixeferewusipepet.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608103524c9fc---18124500904.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/25927e5688240ec74320d5eea28ea118/7958752110.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/19707692458.pdf
    • http://zabradli-znerezu.cz/userfiles/file/87276854950.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6997ecad8b---29643783646.pdf
    • http://mid-europe-ex.com/images/blog//file/xuzigonigimisofagusifus.pdf
    • http://dekoblickfang.de/userfiles/file/81248230728.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbfbf8c431---89247463440.pdf
    • http://botosani.ro/img/uploads/file/vofafefobetefix.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57f6964e5---goramovokenajaxitupi.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16080895375ca4---warujob.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/726819948849e0b3f95132c841b609b9/jatezedopowefuwazezo.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb568c9bd0---83610227204.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090e48f35f4c---fovugevonurakunexanabofek.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060316142780554.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6b2356809---20792578217.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c119.bin
f4d2cf1ecac8916e54a8fea2ae6df93174e7a5d47a24ba3c013786a9f5071873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC119 15728 bytes
font_01_sfnt_off0000e988.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 16792 bytes
font_02_sfnt_off0001019f.bin
8a568b32db6d6bc1311942bc41413c26de63bc81432706264986209f5cfa6d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 10460 bytes

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