Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c18690190ebcbc4…

MALICIOUS

PDF

88.0 KB Created: 2021-07-04 06:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8d46875cff79e1dfb488bd4f1d0308f SHA-1: e7ed4ced50d9b878c14333065afeaeb43761c70c SHA-256: 9c18690190ebcbc4b11ce31c37d551c277a4cac47ed22c4e9dbcd6a1733743dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farms points towards the exploitation of user trust to redirect them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=thyme+in+spanish+cooking PDF link annotation
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/nejuwivafos.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1711ace9431c1300707f5bb512821b76/gezurone.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aae63bdc359---47112098874.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/63510430075.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833c0902791---naxop.pdfIn PDF document text
    • http://www.polni.si/Images/files/75850188655.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/xekivadasiki.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/312dbaf1719a807845150a5f675435df/90402797459.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/wavurojuzire.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/zakesu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/44b15276270f5d40013c6a3a8172a904/38962869834.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f7d7066dc72c35f9085aec41618f496/lujade.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd69e2a4f48---36004741473.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/75510026961.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8d8352190c9507dcd07ba478b0d38445/bokutofotozanixokakapisu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/57770301308.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b40dedd2---xisukajasasidetijavona.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071dae33e540---84896795395.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/15df433e0e9f15744da043fa8393a7d7/29260948804.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da47b3c3e8---32284580832.pdfIn PDF document text
    • https://emprenderem.cl/files/pazizadugakadikoxig.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1999e20773---fuluva.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/xuturuwanodak.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/fejudivegubifibafaxisuz.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_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 10748 bytes
SHA-256: 27c4c26ad0aa2b6291f3603d62b7cb1f3743b8c3e2751bbdd0c6596bfca54a99
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 17540 bytes
SHA-256: dc73c078a56fadbb5c42307bf58c21a9dd5c88ea006edfe3fe0bf5048e4a423a

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