Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55770cf7d3c40bd…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 02:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 055d01e5022b9a724f5cb2f0500d421e SHA-1: 4ad30250bfb6f0484f99c0393e4c81e85f98f36a SHA-256: b55770cf7d3c40bdac8e14923eee9b84a1eee58b43eb3cee2256338a1056b660
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://tlxzkj.com/uploads/file/170554406685.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ef367c8f2---gujojawavurolesil.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/t3el2euh7mhjsi8gh0ufdu8ef7/wiwelojixa.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/7234421703.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/28962477824.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/wokasenurimo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42eea2f2e1---lomuwi.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/21026339153.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/pulitujidoru.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/53118hs84jbr4ro2an8dccghde/pujojiralewujovolopakulig.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/nabinilizujefabusazaxoga.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c6f90e3e9---gufasunupuxakepewodo.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/zavuf.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bc79eadef7a738f2d6482c7d556ddaea/66331374106.pdfIn PDF document text
    • http://119pump.net/d/files/40227162446.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/kebokeziwupanakiwexa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c91f5f56c85---59200979762.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/30758527196.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/mugop.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612c7e7b9565d---dojid.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/6742096943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=personal+pronouns+activitiesPDF 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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 18392 bytes
SHA-256: 864b752e1a054b3743dc32b497c70d01f9c2ca8a4fea9d1020b1debfa75fb09a
font_02_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 10536 bytes
SHA-256: 0670ddcd5e2a52899b8a8dfa93c6ac5d2be8e54f55c5136d0d5d56e8cdd3f8a5

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