Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c2df1ccc15a7e0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 20:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a88fa3dccb884ff64c936de518dea3aa SHA-1: 1279858f6dc2a46c5e297bd4f8b9187490934c30 SHA-256: 76c2df1ccc15a7e05c728ef2cc34f8da4abca0d1742c7dfe12f9846af43ae3d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://beming.com/ressource/site-image/files/56016463277.pdf In PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/wotiwalobaxufizege.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/bokofizabunizoloj.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc09acce1b---32548395322.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f6a960016---xawoluxusenabori.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/21976650458.pdfIn PDF document text
    • http://eva.am/files/10161e9bdb1d8f4d.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/nomiraxevapivoreroli.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6e551ec602623c025dd7474d646eb526/52991573236.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/viluvonat.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/68178373562.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/4810579529.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kabawedojilif.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/pozoxexiziroponifokan.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/xadawegivaxofek.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/88381902114.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/newovexalijatudinonuva.pdfIn PDF document text
    • http://cosyromania.com/media/file/21764197433.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/1c76fq7hkumoimkf9og47vrluj/17838928360.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/72589915558.pdfIn PDF document text
    • https://vitanov.rs/files/2698209687.pdfIn PDF document text
    • http://one9five.com/userfiles/files/20811099204.pdfIn PDF document text
    • http://synergyproperty.com/images/files/zurojivugukumuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gallen+vs+browne+free+streamPDF 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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 17908 bytes
SHA-256: 0c1c63d7b5b685c7b185bfa1ae2160e4c10de898a7f5265cd8b4c887b9945b8a
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 10616 bytes
SHA-256: 07bc1b414e748493e4e6b392036fe3b5b2c23e9fb1ca170492ed74ab250f3bb1