Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb28daf62f91459…

MALICIOUS

PDF

87.1 KB Created: 2021-09-07 17:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 3efe5934658272728f4059c5297471f4 SHA-1: 5a0baf50c5b38ee24e8f503270519ce2d5af3a19 SHA-256: 5eb28daf62f91459cd1b1d3b6f3c043d649e458806a0e0da5c3e828b4b61626e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, with many URLs pointing to potentially compromised CMS upload directories. The document body is heavily obfuscated and appears to be malformed, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/uii780k7iuesatjcfavqdgd791/25947363529.pdf In PDF document text
    • http://pnlestari.com/visitbali/image/files/wuleviworajajukeveb.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/kitisegaradukezananirokod.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/8227597832.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/zaboxejo.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/87910558332.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b2fd11ad372c83e610b8e8db15e1f96b/88906664191.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/eiqc5oplnb62bjsekgvkp8jcpd/dogenutuwil.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/0af8add7d0d64eb559e6d7252b94c9b0/73258569245.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/buxovaxavodefowam.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/76319553221.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/25774024742.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612149294a78e---92482888191.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/zaduvedaredoxabe.pdfIn PDF document text
    • http://szpk.hu/_user/file/sotogoj.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27521854647.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/735860b15054770cb491f5b997506981/resururotofolitovaradito.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/1da6b2cc674fd9a5f8f946909db96912/womig.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a953f2ecbee---gukuvodepobizerizukibe.pdfIn PDF document text
    • https://suksesunited.com/contents/files/bapiwipaf.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210820_085144.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210724_024726.pdfIn PDF document text
    • http://airfa.it/userfiles/file/19809089039.pdfIn PDF document text
    • http://st03.it/userfiles/files/98619123989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lotos+ltp5000d+manualPDF 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_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 10540 bytes
SHA-256: efd8277020a6f3ff21194a7a2b72829aae6a53f1eec8a78f2edaaccd031c132a
font_01_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 19728 bytes
SHA-256: e46b9aa797d41e6f29f276c361846712a7a83437b58cdb93e31f494e3086b4ec
font_02_sfnt_off000136ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1