Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c0faa796f821f2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 05:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79ea9cc226a05a1385811e85fef90d53 SHA-1: d3d88c90ab45f204b886db78d81ffcd307a778b1 SHA-256: d0c0faa796f821f2846e70d61e0562fcc6bf2cf81e976b40e5f4e5f535cd2135
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=confirmatory+factor+analysis+a+preface+to+lisrel+pdf PDF link annotation
    • http://wawabed.pl/uploads/userfiles/file/99468011800.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/28030963950.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/lexarujomodalevukeluk.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a3d48178---7989209278.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160f1de665fa75---1860861205.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/rebinuvetajevarovufafok.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/popubotabaro.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/2484545854.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/38767303110.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riperopipupofoparibaropo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/496c30a867ce7ea015a39c803789ce5b/12139953067.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff808e9d806---digululuz.pdfIn PDF document text
    • http://rotang.net/userfiles/file/56736985336.pdfIn PDF document text
    • https://questyme.com/userfiles/file/zobokifo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda6b78402---timikederaguzomewo.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/22415631356.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607279a58de7c---71574434452.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/33987350852.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9f1f2cd40d0994261a067436536a92b/76565950432.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/gedipupegiwajoj.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lok3tf3oumikj7u52qhusnu3ok/datodiwovezolifegadulupo.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/80219213009.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/kidijonepizisij.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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 17896 bytes
SHA-256: 2a98c914d893b05b2391acfc2a778b40973dcccdd7a541705a5ffd7d47d8c184
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 10928 bytes
SHA-256: 85c15a48398e8fe1147977395c6d1e2791609f189a7aea488ef36e3bf31763aa
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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