Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e643e31c0bba85b…

MALICIOUS

PDF

67.4 KB Created: 2021-09-10 21:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e7439e4c065d0019a8918c3a8b982ef SHA-1: 79538756f2557cc5437e7cfb0767699c90e90e60 SHA-256: 4e643e31c0bba85bf9e8f689d89a46121ed0a4efdd098120931510f12fc036fe
176 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 uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=where+can+i+watch+dark+waters PDF link annotation
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/falazad.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613286880028d---98527736422.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/72636340014.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/26720496951.pdfIn PDF document text
    • http://airfa.it/userfiles/file/64191924790.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/25844552650.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8b21c9ff---vijenimorixiwewel.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/3862795675.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021981645307117.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/fekosox.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/samomulijedonadofomusevi.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/lupujejoporofalarijesawo.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/fejoridixedevavofukusix.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/74875240628.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/buxiwejibuxadaninufutiz.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/27589403216.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///31114660576.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/98403916793.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9155c878---dekoso.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/11905882620.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/buvorulesubulaxufana.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff2799f8f---63256573753.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ef1da76d---912307188.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_off0000aee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE7 13708 bytes
SHA-256: 95f96fa1a403f3a96ec678d33fc6ab34850a1a13398788381226ff7eeaf9cb9b
font_01_sfnt_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 10472 bytes
SHA-256: 60620f3db200010b23307b1b2932fd84db56760d56ee18d63f3574484c21c367

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