Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea169856655d5b56…

MALICIOUS

PDF

97.4 KB Created: 2021-07-26 01:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff310c9276d4e1d0b9ea50674b21b2ae SHA-1: 4e2e616f73427ab11d66d286f1686cc47896106a SHA-256: ea169856655d5b560bd7b15ed933b07a07f23b63417332c8e39af55f2175de39
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The presence of a link farm and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ikuseikyokai.jp/ckmedia//files/58078561910.pdf In PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/950c467cee6fbbe9c813515166e878d5/8659565737.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/t5nacldkcvd238649ciajiidq0/20454075573.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe3716db10---wamusizopawuwawe.pdfIn PDF document text
    • https://promise-land.com/upload/file/9678497015.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/50381255452.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/a8f8032f7790df35c79c8aa12833e38f/dawonezorosu.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8660dbfb2cd6375eacea51125e8d6c16/53031028504.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/rolotewix.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ffd9b1b5---15989724927.pdfIn PDF document text
    • https://netpage.info/userfiles/file/74087756089.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/vewujopoke.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/wijekejatobofetof.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/ae4ee14b8818386bb0901e7ad643d8d5/kalemumilorebos.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/xelobekud.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/49b5d774ff097b39dcfd6f9636189edf/vodebum.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/kowebimanupuk.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/punakile.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609949730011e---purapififuve.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kvca4ta8tespi0t7km4gfittu1/vigokavadusaxumavexipu.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/92772733810.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/woxasufikedezatet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=unbanned+whatsapp+apk+download+for+pcPDF 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_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 10948 bytes
SHA-256: 90abcb90aa4e06271350bd3231c8282fc485c438d933d4dbc7bdefe1f5364d18
font_01_sfnt_off00012e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14617 18776 bytes
SHA-256: 23fdbda3d2c13925bb38b7348121018e27279c5578a55b96ea6df8b3587a63c0

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