Malicious PDF — malware analysis report

Static analysis result for SHA-256 e073f61f4b01c52c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 11:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 924e4924ec73139c65d17e043435a2bf SHA-1: c8e3b662b6fbd074dec0636c4c3dbb9ca5219131 SHA-256: e073f61f4b01c52cc8cc4267a5792435c45c0a6e5ba7223085e679bf78347baa
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm or phishing campaign. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing attempt, where the document likely prompts the user to call a number. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://firesystem.ro/imagini_ws/33228662370.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613277b1141ff---xisumenonolovuf.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/zosigige.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/nedumudux.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/36956366301.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1679743542.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16131157f59fd0---werusopomakefafeguguk.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/vetuzobutolofinix.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161408849ec493---8479983372.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a5c6eb268---60409547822.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0a2a1201---zupowolajeguxelas.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210909_110648_8614.pdfIn PDF document text
    • http://clingac.com/d/files/waxowisisoke.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/91872772431.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d6cec1807---naxizorubovelosodo.pdfIn PDF document text
    • http://attlas.center/userfiles/file/65797221145.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/nr1k5fqo2uh9jl6mmu5gju92v5/sijuxego.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/ganexizam.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/32592961800.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109030452071743.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/lituvemuxebututizovuzimij.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/jepatomubujowerebotulijod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=parking+enforcement+numberPDF 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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 17600 bytes
SHA-256: c6a72c4068c6743b1b7c0f60ff9f06eac4deee93fee6675092f570e5bb7a2c84
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10796 bytes
SHA-256: 3b446774d1fd5fc22a237e345b4f8e8f85f821494ca47c1339b4e53a14edfed3
font_02_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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