Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec91cb1191dbb7a5…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 23:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 203df913463df4f2520ae67943882515 SHA-1: e87d0de6644459beb58442874e0c61f9dee2d986 SHA-256: ec91cb1191dbb7a53000e07f572aab4f6930083b7d2c0496f9b3756c0bae63ca
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/diwoselabolimixobobewa.pdf In PDF document text
    • http://chrislahoda.ca/userfiles/file/57977713888.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/xopufutitobegu.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/11547559783.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f184bd4b19---puzusajakas.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/voxugegegetalof.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/21503790488.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/418b5ee424718574dd87626ce65fa2c8/15325756019.pdfIn PDF document text
    • https://phm.vn/upload/files/ruxuzubibexolibi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d697172c---bobeguzawijebonur.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a98ada91eeb370b3e03f626c0ebc6b9e/37388706214.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/66642203846.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/42227560477.pdfIn PDF document text
    • http://stylekd.ru/files/55137756438.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378c8cd8d6b---jipowubinefuwowapid.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/84016124705.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/fukomipudadaxeji.pdfIn PDF document text
    • http://ihdbd.org/upload/files/fiserekufasuserame.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/dotaludinobidul.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/62249829631.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/21386399417.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/50639926557.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/9596530256.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/44632884072.pdfIn PDF document text
    • http://qdjshg.com/files/file/88024486409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=descargar+wifi+manager+apkPDF 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_off0000c52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52C 10740 bytes
SHA-256: b399f25bcfbb9f0916f346ae41ea56e48d73798f5b9e169fc2340418f72c754d
font_01_sfnt_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 18880 bytes
SHA-256: c5af5d8a5d3465563e192e4588b60987d877e7d7dd1bf70c8cb82032dbf75309
font_02_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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