Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bdea5327cfd2e4…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 00:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19167a57b36623fd0ae70052849525e0 SHA-1: 46476efbcf1b31a17ee5f31437868093f0e1ef68 SHA-256: e3bdea5327cfd2e49c9b8dfa2f4bd0bf56986b833e515d1f2e0a5f5d8c9a3d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, but the presence of numerous external links indicates a likely phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebaec8f42---17441455105.pdf In PDF document text
    • http://geose.ru/userfiles/file/kejala.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-2/20210902092328723463.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/fe494b8c1f4634aa19089567e9a855cf/64949170365.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/24922167337.pdfIn PDF document text
    • https://lapakunited.com/contents/files/jopapajegofubijenedazoren.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/dopeluvikexamabu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0a96c901f7167e8937122578c678d80a/62290095721.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/98153195640.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/26740610654.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/43738324138.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/dalota.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/bijerijijabuvi.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/sajovikugotezulawafid.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631959870.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/zovibonaterupexinafawupom.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109171157494127.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/nolikalupalonumaxo.pdfIn PDF document text
    • http://gibisch.biz/files/files/vavomixesuw.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/wexoguxak.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/01fbf483d1756a5ea32538e71d01c946/62846363607.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/wunukoridakut.pdfIn PDF document text
    • https://forssah.co/userfiles/file/22193714688.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8obbfs5o35ql71dehb08iq99di/rudow.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109070549334356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=new+gmail+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_off0000b185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB185 10388 bytes
SHA-256: 64aa59d82621ab3839d36d054d64cdca3b0a1a36cbaa881b030b62a1e5492c5e
font_01_sfnt_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 15572 bytes
SHA-256: 3441ac911fb76132949374f279322ca2fa447701383cd394a4d62e5afc906ff6
font_02_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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