Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ee899cb4505154…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 15:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 673e0f659b85215a1afcd66129b89994 SHA-1: 18c01a5d6f72599a42f8d8276ff38e296a90b0cb SHA-256: 88ee899cb4505154d03cdd5fdc9b26d16ac44429a925635d6536de936079835d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=bioelectricity+and+biomagnetism+gulrajani+pdf PDF link annotation
    • http://wajl.net/img/file/202188193351.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/34963931230.pdfIn PDF document text
    • https://anjingliar.com/contents//files/lurutikanumejiwepixumubem.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/vefivugozemofebolusil.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///84535610929.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7206018f9f---85572864452.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786b288dd3c---suwaxenig.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/7urrq3tdcpn6irg2ea5l6m47t7/21818793489.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/torijazivanevamof.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a8de2cf71b---lurigatogaxufajo.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/373f7c7b888fce398d1db86988b0c6b9/13632149301.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/36417298a83de26c9d7beabb46c517c6/kejetewepif.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/ridojegimedosezij.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/62167442970.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/wudokiselarepil.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/5361193032.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/gudunoridogesov.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/93234041290.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/1053757732.pdfIn PDF document text
    • http://newo.ru/files/files/mivobogidarezega.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/21ee8be0ef8ceba6e72c8aad849ecc03/29028700392.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/95116806979.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cbb01b340---62507614810.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e9ce0c86d8124d6049ece445720647ab/kigazaxozonatedopuxo.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_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 17676 bytes
SHA-256: 9a2674fe69a1c98368f2a61e7896c1c21719039f5200f823593c0d7b506efbdd
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 11500 bytes
SHA-256: 5387b886016581d06f1e1491f4b79a3985c292101c7d84be2e6a520bf78ee4f1
font_02_sfnt_off00011988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1