Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45529cb445492b2…

MALICIOUS

PDF

73.5 KB Created: 2021-06-26 22:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca855fdc0cd6055ad90b4438a21a0f3d SHA-1: 48b9de7fbbcc2a5a54654c272063820834c8c5ea SHA-256: d45529cb445492b27719f1bbd61fcdee48c9c8ecd79e5302181d5175c0ab3d3b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The embedded URLs, such as http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc2863d2a3---wetigenajuxawexulidabula.pdf, are likely used to distribute further malicious content or conduct phishing attacks.

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 http://atthaya.com/file_media/file_image/file/pitajamaloxijuj.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607d09077e6e6---70030014719.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/nevapikusijod.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/nasojinusu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc2863d2a3---wetigenajuxawexulidabula.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f2e18b552c37c5db2727f517a0fd9d35/bifarunorozevowe.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/wavirewase.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/mironedaxa.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe6311410---20563919622.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/tiraneruxig.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/85940480875.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608113c1b41f9---wadereduzaxe.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/99827192557.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/filekurixo.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/e99cf87acc8f976134a3ffe5edcf931e/56342671930.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210621190206.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/67202425398.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e8d66009c0a50446ae3f6024e064ac0a/30129215275.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pvnu9q6vqae3ekr0u4ln23ora0/tawudufefotugikabodalini.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b5d9b8ece---99142693435.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a95b21ea---nuzogonetovafitesatuwam.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46478c327---8122337007.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/57646389462.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5552f1f6348ae7b92dae95dffbbf0f9a/wosij.pdfIn PDF document text
    • http://alkanboya.com/files/file///43598721696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=french+reality+sex+showPDF 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_off0000be8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 10604 bytes
SHA-256: 095604a385db65a94bbaebaa63a357f54920a03b685e3ab69d74843afac76c3c
font_02_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16264 bytes
SHA-256: 0ba46b9a4c8b4a71018495103d1cb8331fea16f56bde43c4424bb43f83581e9f