Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bde84f7fd9c4333…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 09:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5ffd4fc6d3a301d139ca0fd0777f478c SHA-1: 450912864a51a1cb897e7e08c9a80f5f837ecca5 SHA-256: 8bde84f7fd9c4333bea1c52d0687344d14486bfa8a1ecdb72dd971cd90db5242
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ketchas.ru/uplcv?utm_term=gt+racing+2+download PDF link annotation
    • https://speculatio.in/userfiles/file/rusonudev.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/kusivanimowubosunep.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/foberowuna.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/55752720064.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4dkvk5lfkulqbdeu7grdmso1rr/54749511210.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/radaketutelizonuxu.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/zoxoribe.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/72793407080.pdfIn PDF document text
    • https://irantruck.ir/data/file/javuvimijigogonefojosem.pdfIn PDF document text
    • https://partetesal.ir/data/file/gunora.pdfIn PDF document text
    • http://polletnv.be/uploads/files/16857432675.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/gojajojomozumesa.pdfIn PDF document text
    • http://evola.it/userfiles/files/nesewanafavolaziduwedaw.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/kakateninoziz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc4047ae22---jifemabawu.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/nonidibezodizezerodur.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/zexapajedeladonewejut.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/da67eaa0ef2710fc85f9b7c3e5217365/13402842596.pdfIn PDF document text
    • http://pedraferro.com/files/files/waroteka.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/93649456249.pdfIn PDF document text
    • http://chenruichem.com/upload/files/barapapavuru.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/86720207841.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/zisil.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/22264236520.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/45576930113.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/fudaxujolirima.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_off0000c859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 16624 bytes
SHA-256: 16fb7d6fc093f80fd1ef961b920b1b524b52ad9ce2b538ec2a372ce43e1a5857
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 10488 bytes
SHA-256: ac9dc64f416bd6be90ab16de403312f0e260148220fb01a8ff012445184586e9