Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c753d540c9c7808…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 01:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2100530a306945273f221c2b54283a05 SHA-1: 4eb365c505256006bb1c4792a57cc9203cacd219 SHA-256: 1c753d540c9c7808500276a6fbab75a0f0b8309b5f2befc0c8eeff7185286c66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the presence of multiple PDF-specific heuristics related to URI and link farms indicates a strong intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5435c4c006d6cc29cfb24322246d32fc/59814827768.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608665c9c7e79---xazekelefeluxazoxazi.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/wefurinubi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/firifowefo.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/97245622470.pdfIn PDF document text
    • https://securitydm.com/slicice/file/favemewawav.pdfIn PDF document text
    • https://strechybenesov.cz/content/92833518773.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/sawojifugabukonaxuwinor.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/92751847320.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/j6au9isg0tk3p07db0oh81u4tq/tobapugujuromoket.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/junonegilo.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/wawobanoloxomufiginope.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b884edc68---7837434745.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/94150130622.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50b6232a6a---2134776883.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/46835093575.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89692111780.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/nevedudonedewewefusivedun.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/87220421638.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/67023881949.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/20720019690.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/71cbdbfe0ae2fab0da04c6fb5ebb7fbb/61615788445.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/mufarepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=phx+to+msp+todayPDF 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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 10400 bytes
SHA-256: c73d03ba0aa114735679a0f36bb1c1a0dfda1273868b9195493d3b83840f6f5a
font_02_sfnt_off000110a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 18608 bytes
SHA-256: 2dbbaab994a39539222ec724364c202f1fd95191992d6e5feff9bef42c5fb64e

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