Malicious PDF — malware analysis report

Static analysis result for SHA-256 457688fd151d744b…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 19:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64cc4a07f44ae25934638a06d4f66202 SHA-1: 235ca5a5594210ea04c4fe5742f0fd6efb6a19e2 SHA-256: 457688fd151d744b72e8ec05945a4d107e7c2ebd696e4435386b1e41dc042b18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=turkey+convection+oven PDF link annotation
    • http://tryinvest.eu/userfiles/files/selowezowuwodatibo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/akpk4t1vaj6m7t891nhrlqhbf0/61773666224.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/s0ak322v4frb19c0hdo3dmtkr0/baturutexijojezijavo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4caaaed296---78268725220.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a61fde5c19f---pexurijemepiwo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/cfa8a32a66099bf4504276b41a222f00/17628312770.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/kgtpsppu6guquf0m7a2kf3vb07/vudidopexididuniwi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081f930296bf---55070106117.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/68156541525.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/7914275117.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fc63fe0473933931e355674aa55b0a02/xelojutufavurijireb.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/gunimuxirilemofeliwes.pdfIn PDF document text
    • https://brod-plovdiv.com/images/kopedekaw.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f453cdb051---10380717337.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/ludezegixugagodasutusizux.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/57309268833.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607733de6c6b3---50262393060.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/5a080dfdfe53fd617ae6fd1c47eec790/21808862011.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/bajazedisoxezogokopevine.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210630171036.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/90447bc423ec677b6719a62ef8bcdd25/wisaluzozom.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/4380052231.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070dde5ef035---87637979929.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/56832527302.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a852a882e---nadibevex.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_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 10184 bytes
SHA-256: b881c3045772c04b1cff8de6973a4bee202eadc1b4b908b89756b24f277f6b2a
font_01_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 17512 bytes
SHA-256: fdfeb21103702770bb64be30c9ab3ca264fb69dc8ef025a2faef5a53cb94c87b