Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f862ff282b0f3f…

MALICIOUS

PDF

95.1 KB Created: 2021-07-04 03:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51b7559cac9ea2c753e2339a4891be6d SHA-1: 59941984412dee92ac8655cd343b2966e2f64e96 SHA-256: b7f862ff282b0f3fa0ef8e56f6ff6c63f0fa56b4408422bf55a0c6e809e2d576
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=reverse+takeover+share+price
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/dq86gmctme27hqieikjeo3cqp5/dizodaxebozopafifefo.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160774602dd6d7---titevigazujikoravama.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b784d46343cbb6b136a23fd0d9a3a5d6/fotododezefeju.pdf
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/veguwopelupuvidevanalo.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7ee6363c0c696551f78c1c172e9646bf/11876577930.pdf
    • http://cameranichietsu.com/luutru/files/59157948787.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f6747d7274b33bb2227b8bd00d85764f/wopotejonazisolelo.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d3e9fec2efd15eca85513fecd3a5cc3c/nitilobumufizuzugukeliwev.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/vunebiwekajifudig.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2957b194ef---53963463542.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634738ac96---fibitavexevoxoresawafulon.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5f8bc2a6f---pekobizuzufat.pdf
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/mojiginofotidefasofemul.pdf
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/54048688794.pdf
    • https://camgloberealtor.com/userfiles/file/viginawugiwu.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3d20c86e---kafepesekilot.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/26feb13437e1d86048c15f387c5620cf/19492118481.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4fb1c8cd---rinogomafobojax.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/kodobubujoturebi.pdf
    • https://capecoralliving.com/media/file/54255330049.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/wizoroduvu.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e4356d03ab44e47b71279d57d3fb18b7/kafoxiwojole.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/47bdfc93fa0e16beb880576c44696219/susurugo.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160722abe38297---bemitovipivibasekafewu.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42ba710dbc4aa420e301886f8d722242/42917148442.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_off0001102e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 16792 bytes
font_01_sfnt_off00012840.bin
7f92ee979c5274d3aec1bca54d88a99f20d2ba8e2e1ffe72382de7146871cdf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 17676 bytes
font_02_sfnt_off000156c0.bin
f9b3d755836b43ffa0c99dbccc3a54f62be89ce61082dd3d1d26e327d5ce8467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156C0 10524 bytes

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