Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ff4f0b44cd2c3a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 15:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 779a4a5f6b217ee5a1d5d7579c95c880 SHA-1: 49353544cb48f711467953363ce427364199070b SHA-256: 98ff4f0b44cd2c3a732e5c9d1239d11338a1fb444d1ad83c6fdc9fc076b57287
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm for SEO manipulation or hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dom4m.de/userfiles/files/62288019331.pdf In PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/72964626865.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/kebefozosizo.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/koruvezozibo.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/89326077801.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/184e3055c8a083a603dd8c07a31aa2a1/puzosovotavepamibeti.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/30799282707.pdfIn PDF document text
    • https://ikima.fr/uploads/file/mopuza.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/tuvexamojevuzajideliv.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/sudalumuluzulefofus.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0400000a8---46563899337.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/8837474420.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fizuminozexike.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/66164614047.pdfIn PDF document text
    • https://educhina.mn/editor/files/4461238560.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/guvalerilikitaluv.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/tudiziwibikosugoje.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/10613273936.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/97278153860.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec47b7dfb---80694742383.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/puxiziwexubifulu.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/retirolefi.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/82142680458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=naruto+ultimate+ninja+download+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_off0000bde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE4 10772 bytes
SHA-256: 8ab161ef99f09d874b79baf912d015a0849d4db8290769a95edc060a4434f6ac
font_01_sfnt_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 17040 bytes
SHA-256: dcc11e04a0061d8251f5b0f664981be7373b829be73f2e47bbf100bd6627a413
font_02_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1