Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3dbbbf1d345c09…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 19:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 75ae4e40919dc4872ecd1f6c8e6faac0 SHA-1: 26a5e4cf33128bd786344f0cb2f069fc59ac3650 SHA-256: 0c3dbbbf1d345c09cf643ea92f073caffcb33404aa72609bd2b7e3fb0ec9614e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=brew+install+wkhtmltopdf+not+working PDF link annotation
    • http://fsgzb.com/upfolder/e/files/20210831093320.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/27b25f1dce4fc0201a6f0152945f96e2/wogikarexipepabutone.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/36b534c8b12988a6eb7fd46aca06b3d5/sapudaleto.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/90971865311.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/wogumuloxilolidi.pdfIn PDF document text
    • http://nature-revive.org/files/file/90496572356.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14582fcfb---fovekafeziwujibebuxat.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/49720360160.pdfIn PDF document text
    • http://iucecb.com/files/file/21232967235.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2faf8abbc7439b08f36a42e9c5e13084/77232463013.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4dba924ce2797ec3c62dcaba1de53cda/tiwuvasokewatibirazeso.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/8km8u92n606j766p8r3bhjp3f8/lebegemob.pdfIn PDF document text
    • http://cartopack.com/Images/file/jogexipurazazudidugumiror.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de6d4e007---4680716634.pdfIn PDF document text
    • http://huiking.cn/uploads/file/270638207971.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/70453364637.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/57204f51ed0e6677ac539b5d86e51c1b/62290326845.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/tifigolositedanuleseto.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c58aba797---duzag.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9467243c31---xawelaxogubitimemi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/safojilajofosoke.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899f100c5ff---25027245418.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/85146502947.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_off0000c5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B8 18940 bytes
SHA-256: 9253eda99ce490bf890bfa0559cfc01ba893625d13a072e2d0150d03f166b06c
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 11176 bytes
SHA-256: 4fbf8b32a79250e8071a951ceed6f0a85d99cc0dcd3de38bcf9bfa80815f64f3
font_02_sfnt_off0001116a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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