Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce1df58c62e58bf…

MALICIOUS

PDF

71.8 KB Created: 2021-09-02 19:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 055dc29ae1229d3e880236b81aa19a45 SHA-1: ed206ddda3118d86b8ed59275584a69e9e0278f9 SHA-256: cce1df58c62e58bf6a610c0c380aa647b9223d6444246ed5a9cceed73a4c4220
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=la+rebelion+de+atlas+resumen+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce711b038d---nikubupapojamutulepovu.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/6798743175.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/95797340362.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/doxenatavenaxilem.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/bavatedanarulatesigubu.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/18981670850.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/32079166499.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/45434679307.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/4688211987.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/29456974198.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d04aad7c165422cd3c845aea1667fc09/4930618448.pdfIn PDF document text
    • http://erex.hu/upload/file/15165468484.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/gujajonajexod.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/vuvozovopox.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/82286003393.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/rn1dj24erfdng4pfucu47g0u7d/puzajosixuwizafo.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/35322645243.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6fecc16d---92348739716.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/88606859722.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/356a4cfd8bc5b0fc1afbbf5c4e20dc4f/todipinibelete.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f0c76addec9cad431a8fdf7917b1b380/8011391875.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_off0000b05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05A 19904 bytes
SHA-256: af594b2a9a2206e9d240f6f03138f64d6754da6b8c2e43b2757ebc04de288a69
font_01_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 10856 bytes
SHA-256: 937e1c43215d60d13cb8ed519324efe6cb8508a7e2efc00b25a3afab943fce3f