Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9729db1e35efe4…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 00:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dadb6b36a74b3157e88fd86b4e734c0f SHA-1: d7b362d16213f7920a8b133aec527b5203ec1328 SHA-256: 2d9729db1e35efe46351351c6c5f8eb900fac4cf77a193010fe3e9b3f1c349a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://marbeyoyun.com/calisma2/files/uploads/jegabogon.pdf In PDF document text
    • http://imailbox.nl/images/uploadedimages/file/27032999496.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/vidumejibozokavifi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ud65fomg1n7gst3i8qoffrkep1/dirafisiban.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/35406205163.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613615e05bda8---61451570983.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/13410719242.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/51189057836.pdfIn PDF document text
    • http://lenaoyunlar.net/calisma2/files/uploads/kixeniger.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/85674821937.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/maxiretitixodobuxawasedef.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/zusajikibesefogafaboraf.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/80528309350.pdfIn PDF document text
    • https://websbag.com/uploads/files/1896521931.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/8436570369.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/xadomulasemufubizakid.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/70781692120.pdfIn PDF document text
    • http://93564497.com/userfiles/naduzagugefanesudazawer.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613927cb0c393---karagodajinexodirov.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d0e26e77738d58ce171aa86fd8e7df7d/segude.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/43922246531.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/jozofafije.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/ruduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=contact+android+to+iosPDF 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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 17788 bytes
SHA-256: d8207fd57819e61af536e759612b07e1b44cd80ffc1eb737bc4c3743dc27bdc5
font_01_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 10216 bytes
SHA-256: bf0a37a915cd320537be4e63ca6a73419d558d3829a4cfdf77d3e122aca5e0e2
font_02_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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