Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d170647031390f0…

MALICIOUS

PDF

74.5 KB Created: 2021-09-28 23:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e45b41209d8552792d01f94d94ebd975 SHA-1: 7aece49a264782239f4fb62e9667757c123d822d SHA-256: 0d170647031390f028630fd8aa6a4e271f2183d5fd57ea2961d20eadba5b122d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://xn--h1agcmh.com/ckfinder/userfiles/files/59094368345.pdf In PDF document text
    • http://fgosvo.ru/files/files/5775482048.pdfIn PDF document text
    • http://kco.su/userfiles/file/76828915063.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/45800098369.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25e2cecd3---78608064360.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161415f07553c0---xupolesawowifivefikat.pdfIn PDF document text
    • http://air-ned.com/uploads/files/lanojuwagusepa.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/jafeboju.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/doxaxatoxonigexozajugavu.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/14942958234.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/junapufamefelupasebapuv.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210908_8D4E2408F294AD73.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/lejesujenigevure.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/797457f4275bff67716f586ee2f9215d/vowobesatagosibobagi.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/48056347826.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/nivawadepijumuselesegekig.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/vixevotijoliwef.pdfIn PDF document text
    • https://robodom.si/files_vsebine/26067688782.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/dezojigoxidatobugudapi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pixanidiwamonuzoda.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/76871514573.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138a7dce850e---47463258696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=como+usar+apps+de+android+no+pcPDF 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_off0000bac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC9 10660 bytes
SHA-256: b9717fe6f3ac2b6f5a1f64c84d4061da5111b48d1349c3ff126aa504ff865dae
font_01_sfnt_off0000d32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 19140 bytes
SHA-256: c9976168d530400f299ffa5d265b6168d65229361c7c7bcf3558cd8df32005b6