Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76d7fb24a42c71f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 01:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 536985e4a373dfc5a4dd8a68a21fff48 SHA-1: 3294eae605b41199f5f95028c66ea70ec55159f1 SHA-256: d76d7fb24a42c71f06ddf1a9d9cd2e17a90ae3b2defab8f2a51e70c61fc20171
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=redeemed+big+daddy+weave+chords+pdf PDF link annotation
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/31d46b1c7a99ad99a4f15fe1b94f5ee2/kiwagevego.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/e3fi3n3dvalenthrojuosqok90/30757939822.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/30eec7911c778f4b54b40d74de054604/92044569336.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a32eef005---80307051364.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021080114465066.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60f0a7244---67759983728.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8e574493b---55147205102.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/93514677808.pdfIn PDF document text
    • https://paradigma.bg/uf/file/17988985055.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb3ade43f9---57902920626.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2487911bd7---43657684552.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/9181725426.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/tebesafer.pdfIn PDF document text
    • https://777mto.com/contents//files/90675341096.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fabea4c39---90087049024.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/eda0da9cc80ebdf97886927cb39f2625/jetufexavakulisa.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0819277384977f885af017d06d75e5d3/31223118202.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/jitunadu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873f94a49d2---sukavavibetevaj.pdfIn PDF document text
    • https://invest.pl/userfiles/file/jofonetiboko.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/tined.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/21363326440.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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 11272 bytes
SHA-256: 236f782bf5c07937dd65bab5bcb725e7749f4b54bf33c7683635375ab178f2e3
font_01_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 18320 bytes
SHA-256: f9707ae9264d88aebe48caaab7e8ed36fcf28c8e914109ba36dd0bbb01f63ba3

Open this report in the interactive analyzer, or submit your own file for analysis.