Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3dcbc8bcf030ea…

MALICIOUS

PDF

69.6 KB Created: 2021-09-14 10:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d41824dde966d36e7daccd9df48c7efd SHA-1: c9614f4f580a51d6c600775e0492efa7640ec156 SHA-256: ab3dcbc8bcf030ea57bfb15bd34b8ee58c0fcafb9b2b090672c08d9329212554
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=best+text+adventure+android PDF link annotation
    • https://aawyx.com/sites/default/imageuser/file/73742182573.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/wunaruveforodam.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/21764925693.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/fagadamipomu.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/xonixefe.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9eb4abf79---29102556669.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/dejakevofuvekala.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/44928373654.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/76961353642.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/govijawavigarege.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/89236638293.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/fimibapevegofidamupezimam.pdfIn PDF document text
    • https://hojoairport.com/images/file/vonukazeneso.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/guzowewulopibugekorumesuw.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/96148960657.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/83625630903.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132285e15f59---11406271501.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614017d80181f---5192492886.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109110808018678.pdfIn PDF document text
    • http://proxima-design.cz/files/file/88006694155.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d812d7672cb3f6292314f5e57f81ba12/nuguraverisidaf.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/18178465570.pdfIn PDF document text
    • http://guitarenko.fr/img/files/40044791497.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210908025637.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_off0000b380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB380 14840 bytes
SHA-256: 6c221515d14731019262dd80f63820b3c56cc632be87705b2863e4a8ee7eda07
font_01_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 10516 bytes
SHA-256: 3db9a45659f2b6cc89d8930651e784ceb3557e6d0b9410c140f25dc3147c58a1
font_02_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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