Malicious PDF — malware analysis report

Static analysis result for SHA-256 3687ad02bd3647f6…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 13:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f934a5111a4636064e842baead6e48a SHA-1: 5d345159231f5483b1ec65469519b58e3a02084a SHA-256: 3687ad02bd3647f658f6670e44daef3591853998f516aef4716b686e7f28f337
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The presence of urgency and download button lures, combined with the compromised hosting, suggests an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0elhmc0pl1gk52f6aj7hoe91c5/17071050334.pdf In PDF document text
    • https://mokshadhamnepal.org/userfiles/files/gusibamatunipefazipisose.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8504056c---20688470116.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/19351026949.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/newevinuremegilof.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/39205885234.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/38580235107.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613705482f9b4---265628107.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7de0d570---wazukaposaluj.pdfIn PDF document text
    • https://kuepancong.com/contents/files/medesuf.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/68149368512.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/tebesixo.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/polobuvigidedokumot.pdfIn PDF document text
    • https://anjingliar.com/contents/files/xuvosajekoxeviruxin.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/rutategumuxop.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/napemasaguj.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/3687519599.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4903302c1f87eb484ab35c5f997732d1/71883405556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=me+hoon+na+full+movie+onlinePDF 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_off0000bae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 10272 bytes
SHA-256: 839b1cdc1bc2612c6f8f7c2cd4b36909967bd1539e665509d29e11df5eb4cf40
font_02_sfnt_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 19072 bytes
SHA-256: b8643d537e1285ce82f949281c6fdf9fac84ec577410aa8d6c6e34baa78a997d

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