Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e9205455ded866…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 08:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1a534a39e15f8bc632f88c468ef7ab74 SHA-1: f09334a3f78c0ffa484071dc1dfa2fce6e888d96 SHA-256: d5e9205455ded866922a285d1ccbf054a4411bcaada678abbb542714c05ee0a7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=vidmate+hd+video+downloader+old+version+free+download+apk', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=vidmate+hd+video+downloader+old+version+free+download+apk PDF link annotation
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/19686237426.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/dozugaleruvonuzabox.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ie86pemvt1its9975h2eokgkdh/95070235643.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/27317240652.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/25325423558.pdfIn PDF document text
    • http://canvangdientu.com/images/file/93670505767.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/wovezokivegefa.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/nomulomufi.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/mujepamobopubapudov.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d7d98da4f1dcd724cdcd1361dd0edeb9/wolotujutisoka.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/62021028484.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/11804081935.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/16221359994.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a193f60ee2---52836592884.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/67528248851.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/1097390265.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/fd8a1ab8a1faa70fb72278cfe9ac5a4e/mawopojet.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/37090603469.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/73066347126.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/51477225815.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/80002096713.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/sorutusova.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_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 17592 bytes
SHA-256: 5f33d062354c1ec62e72ade091b276ed5d69162a4d1ff6a20dc5c50ebd20c005
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 10976 bytes
SHA-256: 1ac1b91d6afa81ee9970c0cf211bf1861f82cbb91ae8a8ab4e733ee53b3298bb
font_02_sfnt_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1