Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ece1dc35443c2a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-01 01:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b193c141ad5b2a303b8e9a9338fbee5c SHA-1: 10d2bfbb502da3c63373f15d7f0afc4525cdcbd6 SHA-256: 53ece1dc35443c2a5a87d0be701a0a7b6f600a0f4fd010546683f658382bff24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=kgf+cm+to+ft+lbs PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6d6b4d0cc---63441776937.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/rugebejefikivugi.pdfIn PDF document text
    • https://artenika.pl/fck/file/safipuxemedobaji.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/45728614958.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/46814937282.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9cc3cafaa---xoxirunitunimofazobijuv.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/66371945310.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a4aeae7ae---16760455366.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/gikojagoribazadonegafi.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/sutaguropazigugixalum.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/82937030432.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/fagitoz.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8d708e0fda822f32d96a6794ccd102cc/dezejidofedikemo.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/sawifuwibafozitixu.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/2820099042.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117bdc39a301---xifesoruzosapepopedowi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/3dob8vkvarqtckm2eme938nog2/65714297457.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/1139615862.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/gakumolusukut.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/ravanikuv.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/gegepupedumatipav.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082d09e45e64---nufevew.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/991acbe3d7a59d72e1b1dc755a312f71/20047421979.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608667992b01c---junesojevixedol.pdfIn PDF document text
    • http://klinok-saintp.ru/files/97066622128.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 25096 bytes
SHA-256: c897e412887af6c851cc70cbea654a5b78ae96b83707ec34627c41c8871858b3
font_01_sfnt_off0001131d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_03_sfnt_off000133e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E2 10220 bytes
SHA-256: 9c9459ded477e09aff66d423704026b544f8a03967a44eccdbfbffea95d5eea5

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