Malicious PDF — malware analysis report

Static analysis result for SHA-256 4829317c7c99ae8e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 06:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c9e94de107d02aa0ce3151de38a6aea SHA-1: 6586cbe566aefa4962d754c8be1a4fe5f2b09b72 SHA-256: 4829317c7c99ae8eb6f214045556c3821303ba2bd771a2eba50360b82b76f3d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=filmorago+no+watermark+apk PDF link annotation
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/15406676417.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364d7f4e6b6.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/52950666676.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/87689558335.pdfIn PDF document text
    • http://palami.by/images/file/89782589390.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438c6915dcc---xegukezivivuwesomeluxodaw.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/70475005614.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce18e6f4b---93681364251.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/82769438845.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de8cf7823dfd8f9b9b0572597aa5d54e/77086807944.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/lanepaj.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/20297973211.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/zamekenigojawodesedakikuv.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/71344016599.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/tidirevezunogorogutuwar.pdfIn PDF document text
    • http://marketingnews.fr/images/file/lebivomavajetupo.pdfIn PDF document text
    • http://x-mobio.com/upload/files/67808364782.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/15206241776.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140d53fd7e89---6758462875.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210906_7B7C62593CA62418.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/98454903175.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/bonagojeteguwoxiwajijen.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/ratetiwem.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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 10584 bytes
SHA-256: b675df5b70b01987dae7bd72fa9de771df557e91a64ff1f0465639fb79147c3f
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 18516 bytes
SHA-256: f370f82050d94ee92f3db64752f5d241729f711095ba219fb6cad37c9b6ef567
font_02_sfnt_off000122ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1