Malicious PDF — malware analysis report

Static analysis result for SHA-256 323b1b700de193e6…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 19:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3e34088ec6b738cf0c1a42050ec6e6d SHA-1: ad52e6539fa52fea8b40d0c6aa1b13c3dc352917 SHA-256: 323b1b700de193e69f4525242d0ee71b35a027cdb46d9c481aad4cfd01da535e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eggtesting.com/admin/uploads/file/6203732418.pdf In PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/5575846844.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5aae9f95---91150121617.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/pozafa.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/39422305281.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/724afa3825e9b660445cc533c7920d71/xumuf.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/dowetamovok.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/66032570676.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/67759930127.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a33c089fcb---17454434107.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/kafozadevifami.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/mebiridasuxofi.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd0e94ed9---dokefoxalutomedigerulal.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/88676116185.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/27052030543.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/88184299502.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/65574493200.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/nukerejawekisulixifim.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/50554310057.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/jibenoxeramedonub.pdfIn PDF document text
    • https://ever-progress.com/upload/files/satalovinulekijedomegox.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/57374970279.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/nigezuvupu.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/gisenuxa.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/jupuwezijiwizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kamsutra+film+kamsutraPDF 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_off0000b61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2E 17728 bytes
SHA-256: ea9b50693d462418caed1838c02b3b0bef936646fb8adf235e007107f1dfce86
font_02_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 10200 bytes
SHA-256: 9bafcd6697906a1d852196fbba7ad2392c3d64f28b4d1aecce217c2c490bb90a