Malicious PDF — malware analysis report

Static analysis result for SHA-256 523ff1e63fec7f79…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 08:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b536ea6b2f52bbd534d186bc1c78d486 SHA-1: d18f99691e1091943be71b8c32d42388d9556756 SHA-256: 523ff1e63fec7f79219c7342ea38bb71630a98dc4d32b0f8dcbf4b5d07ea1e16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cructi.ru/uplcv?utm_term=free+download+software+pdf+to+word+converter+latest+version PDF link annotation
    • https://cambodiadriverservice.com/userfiles/file/76170190546.pdfIn PDF document text
    • http://temple.mo/userfiles/file/xewunakumik.pdfIn PDF document text
    • https://aashianarealty.com/file/lizorugazawutopime.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160724b46ef449---46349715586.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/98teur0go38fbenph7l8fqveo4/tadexasefabogovefunivi.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74cc11c0c---fawuwomiluba.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/safud.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5a742606427a66a71c9bbd4c9508c48a/97771283560.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/voxerimotugonuv.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/sajafojesinunuwiwa.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ra4r0l2itu5ll74dcs6rdohmc2/romulis.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160782d479d337---17028966735.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e10e6e076ee---nitogasanasave.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160f167d07bf26---dukizasugemeg.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/f4q7p9p9l6r812j13o18uj084d/gorobiroxosaxirifebatipuv.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/fepolivatutu.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/27296129643.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a883cf86f5a---lazobukoganojotekalojix.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/qlpuehks47t5pslvqus1b06rtj/widelupesixogowo.pdfIn PDF document text
    • http://terrietanaka.com/library/files/26951292842.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/jexukesamapadepizemal.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095cb603b75f---wemigona.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/16391658166.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/18249529586.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936ad2aca53---nefawomosigazugal.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/mutanuwabuzoremidawijuzut.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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 10744 bytes
SHA-256: 024909cb5723050f76afcf7011a736275cc5dbc50cc9f2bee9216d968cfe136f
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 18160 bytes
SHA-256: 19aebd28dc21c85e51612c9d8ac450c5cbb3db0ad7ac1d36a709ca109865660b
font_02_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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