Malicious PDF — malware analysis report

Static analysis result for SHA-256 1936a1534c6b0f55…

MALICIOUS

PDF

112.9 KB Created: 2021-08-06 07:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1a17f097b1a5863009c5e673b97df33a SHA-1: 09f010d4f5b00bbe6730b2793905777057534679 SHA-256: 1936a1534c6b0f55d2ac62dd0aadc502b5557d4c84da47aff23b2b13f2ebc9c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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://krisoc.ru/uplcv?utm_term=kits+dls+psg+2021+para+dream+league+soccer+2020 PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/52bf3e42b3df76325118d874cdb9f447/meledatew.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff03a37fa73---kopinavomomoniw.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160880337a7e2f---35445853201.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/61929756285.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608227d759739---laluzonotawiwe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb210280fd---22314111940.pdfIn PDF document text
    • http://winso.tw/userfiles/file/vajigamuzirisuxamakife.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/23232576160.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/divevob.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/14084585666.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160730cf2d8b88---rorutulitoriluvu.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/jafasidax.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e870c1a6be66f94d52b56779ed53fb00/gozigewabefetemujexomuxep.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/15094887146.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/bikepupuxugovosajeviz.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5cfq5li4eqat2b7emnhmkd4f53/kozevoloxediderepev.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/91964267794.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b817fe85e86---70079421779.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/161030f058b8c5---jipunet.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e614b36f3---69293642582.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/87344012417.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/xebirororexav.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/zogona.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/45996288019.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fa55dbd1673---galevi.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4283bd9a11---gufeborezijowuz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000155cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CF 17016 bytes
SHA-256: 34fdaf012e8c2a97d1b95598d1ab8f385846eb43cff9991dda3173e1634052fa
font_02_sfnt_off00016ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ECB 11140 bytes
SHA-256: 22e40e3824db4a1565192726b204715f778c552496fb5ee12932a7b829bbde3d
font_03_sfnt_off000188b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188B5 16988 bytes
SHA-256: 5da18fae228dbbeb3aa0b0827d38ea1618c478f5dda64815dab72aef2c463c6c