Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecbf7c76951dec9…

MALICIOUS

PDF

78.2 KB Created: 2021-09-21 00:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a7c7c37383a6286e4b90ce9eba1cfa0 SHA-1: c86418a78ad7856f8c190a0790785081e5ac693c SHA-256: 0ecbf7c76951dec93f322854919f1cde5fc5efd7d99a87e52f58b645b3f88330
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to exploit users through these links. No scripts were extracted, but the structure and URL analysis point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0b1ba2db---52257232692.pdf In PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/15870440200.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/limavofibapajudugaji.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161467f6008ac8---zapexekak.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/74105475116.pdfIn PDF document text
    • http://vln.nl/files/file/lineboganurek.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c0d7a7c32---70141172347.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/xejizofibiwogepogar.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/wajuvowemifusamamogamoj.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/19002101481.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/xusevev.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/delilanobadilus.pdfIn PDF document text
    • https://kaparatt.com/images/File/dusakubadibivatemibos.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jarusezojadokotimujezidev.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/44938719868.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/xovupaduwon.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c01c22273ee9d0972f75a41141b0e9d6/rezaj.pdfIn PDF document text
    • http://glassick.com/userfiles/file/sufefodikowuwuvir.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/sepobow.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/kakuxuliguwavir.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/laxusejasijotigibojuvigi.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/wibigiguje.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/52092537618.pdfIn PDF document text
    • http://www.bandungmesin.com/file/zutagarozajagize.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/90856567628.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/75510036122.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/45088112429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mydrive+connect+androidPDF link annotation
    • 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_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 18036 bytes
SHA-256: 640778f2435ec175df1a1feb0166eee808194254d9a949c419a7cd4374433814
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 10324 bytes
SHA-256: 908d1a16ca636c415d7d903add0064757c901e4da47217fe540315e21d071ecf
font_02_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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