Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cea6edb2278d85e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 10:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: edb6495a427cf2153c5330ca98515495 SHA-1: 71f94fc31314b84945cb6f02ae287e3f3867c752 SHA-256: 4cea6edb2278d85e9cd37c6483811d1b83fa0b0063b1dfec55fae7cf710fabaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=hbo+max+free+download PDF link annotation
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210916010335.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/14821489897.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/9282062242.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/dakekis.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6eb94324---fitodanogus.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/32618364115.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wevijozenonomi.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/lisirererefo.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/66073345706.pdfIn PDF document text
    • http://fitviewer.com/files/file/35646493739.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/21625932957.pdfIn PDF document text
    • http://merwepizza.com/upload/file/21386041181.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/12762577995.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/mebapizejonesagoperipebu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210917205806972.pdfIn PDF document text
    • http://rilta.net/userfiles/files/55893616936.pdfIn PDF document text
    • http://splogservice.ru/content/files/guloxuvinopijogiju.pdfIn PDF document text
    • http://kme-kme.cz/files/file/14592186578.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9fd5aff32---kaniti.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/64347449163.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c0d70bf31dc5e067f31929fd88fbfe89/lofefefujerodadufufodeko.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161302a8e09bff---midofusajofisulima.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/8062351478.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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 10476 bytes
SHA-256: 1f0d4fe0a5e31106d27ca24476cd2bfdbacd02e114eb37f95ac23a91dd59c7cb
font_02_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 17584 bytes
SHA-256: bd8b7e26cacb733f104153c5a0701e230d2462365adc342413e8b8e5af0aea05