Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6771c2d50f742f1…

MALICIOUS

PDF

69.2 KB Created: 2021-09-19 21:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ce7fdb8f5dc20336922bc46607c840d SHA-1: 592623045e264c0b7eb661c3a2aa14cac16e56f3 SHA-256: d6771c2d50f742f10fa5c7f2157e803ed95f38d2f6ce908faba3d8093f89a941
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

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://queure.ru/uplcv?utm_term=dynamons+world+pikachu+mod+apk PDF link annotation
    • https://blsautomation.com/ckfinder/userfiles/files/50535915390.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613292100bd93---karosezazon.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/31103955732.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///78558156231.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/82707715093.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/72345860125.pdfIn PDF document text
    • http://ore-processing.ru/d/files/javufanilezifudosanisujat.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/pibumonofalis.pdfIn PDF document text
    • http://contelex.it/userfiles/files/rujazofumunu.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/65215578960.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/gevukerisewemewolat.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/bimibawobisuziridirado.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8aac52f6---29374082769.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/16584301062.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/kamomaxaguludeneworejov.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/kamepememetugam.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/fijozogima.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/jaroviloxeru.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/90197561018.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/tadakisa.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3248bc74299e5e58bc882422ce6990d9/tebogis.pdfIn PDF document text
    • http://i-dron.cz/data/file/24519164632.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109160101045940.pdfIn PDF document text
    • http://bptramptour.pl/files/file/27289807768.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/tojurunoveseletiwigu.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_off0000b1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C1 14448 bytes
SHA-256: 9746aa78b90bc628dae9348be3c5626908d379b888b91f8a58f0b6d5fce7d162
font_01_sfnt_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 10940 bytes
SHA-256: 3830c984cde5598086f33af502b4ea29bdd8d3350cc9735a5a3e4604f451cc4f
font_02_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1