Malicious PDF — malware analysis report

Static analysis result for SHA-256 b100e41b3033b91b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 02:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c3588f4a7c2cd5ee4751485831ba3da SHA-1: 3e161e531cd2fc4a43c54ea6af9c4b32be2acd22 SHA-256: b100e41b3033b91babaddb0f4fb5b72aaf40a39c51df4aed18f234c895c1c5ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to manipulate search engine results for malicious purposes. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=form+no+19+pdf+download PDF link annotation
    • http://www.kickcommerce.com/userfiles/file/98332446927.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021871042438360.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/pajugoxe.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/jorokotakupilo.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/88058118059.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076942a09b33---tusemuxejifaduwel.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/49d89c359304e5ccb11af88d3e0f9561/pazej.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/71525200439.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rmvi1klkbts0qicrvu5nphbsg1/45798946642.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/muvuvexasenefajaneb.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/dipolalodedak.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/103789577360f6c6ec0685b.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/386309968608b6d61900d8.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160da589c6fdc2---43353745871.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/55135989852.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6i6jkibdd2ufuob463kotb6mt0/42344239332.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///92179935883.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/resol.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/kle4g94ftatvj613vmac3kcgpc/13247489682.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/39770fb7a9a0ba299350d77379d595b0/9889539597.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1fdfa3d33---gobudonarutaxaxevavedalow.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/bivoxewesaperalezixev.pdfIn PDF document text
    • 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_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 10452 bytes
SHA-256: 0e745c21d30b1d2f6b456276971ef394964a981529d4d957e81872cb54f2897a
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 18620 bytes
SHA-256: d78726a02791a5d6fc302115eb213558d341588b13780ed80cb3d6ca3c926d4d

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