Malicious PDF — malware analysis report

Static analysis result for SHA-256 d875a8e18250792a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 07:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78b0c4735457b8b8d0815398ffc37fcd SHA-1: 1295e5cb49ad74003def63ec3ebe1b730bd2dc22 SHA-256: d875a8e18250792a3ecaa1bd04ec0c53d68de5ce5e2f33913015c978c593418e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an attempt to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=illegal+streaming+sites+football PDF link annotation
    • http://spbi.cz/res/file/luvamana.pdfIn PDF document text
    • http://agilesolutions.in/uploads/kafofunajiwajo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4c77980c---32603702494.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f4f8ea4dc79375a863f6010313cd2ab0/71021771498.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/46657379299.pdfIn PDF document text
    • http://m2m2design.com/userfiles/50264638054.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/58637133782.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/luwolutaxe.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fcb1b891---69861882714.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/sagejupugodarez.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/37239438302.pdfIn PDF document text
    • https://redac.ch/upload/xomaretasebazajugugu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16147f15f09ca6---sifuzewepelezufulukadu.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210913_190336.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fumabarijediwimatodo.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/91013165422.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/xofaxoj.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/mefotiropakinewabogu.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/11114367873.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b6a28dc1d---wavebozolelago.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/jakixewanabokevekujusamap.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/jarolufuvegawowe.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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 10648 bytes
SHA-256: 1a0d0d92c6d72e8ef4e420e610cbf0f30dde9805e4c6e38c096567493e5a2fdf
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 18300 bytes
SHA-256: 7456937dabfae0ef825b0022617a0f892c083058c9e9424eb8039e122968fb0e
font_02_sfnt_off00012f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1