Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a46f79ebc7f2f9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 05:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40b8379759bb588dd60d97f447029dcd SHA-1: d11c69fc0fb7b1c5a30df2ded884fec6ee42e502 SHA-256: b4a46f79ebc7f2f99739242201eb800fd9ec7a9de6892640e6fa6b2957ac3d1a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://master.plus/wp-content/plugins/super-forms/uploads/php/files/fc9c8c67086937809283eade11b68ef8/22017420535.pdf In PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/rilunadomix.pdfIn PDF document text
    • https://razredna-nastava.net/files/86951904337.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/waxinorivitigegakajisijej.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3531615c637037a6821de2019c5daed4/zatizelozigenepi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6103d39daf5d8076abbe864af9ace6f0/26760601374.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/aogul32fs218oo2t6ofv66kjpm/95181033165.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/52962552249.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16110fd775ab6f---nileluwefobawal.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f65fda392---jopikire.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/30343307039.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adf07d8bc3f---zimukiluw.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/52706672542.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5226e46b2---gegizadop.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1s26uatiobe168eu5fpgdb8qf6/3385012455.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/26307795027.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/woroponofanajezejezi.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/48899999503.pdfIn PDF document text
    • http://recviem.ru/img/upload/garixutekimogomovefamizor.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/78643916380.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/97981727639.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c85473eef---jixazuvu.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/4081583591.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b01956ea593---dipodenadupefifubaxipami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=honda+civic+5+speed+manual+transmission+for+salePDF 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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 11072 bytes
SHA-256: b9f18292967cbdff58c99c294c562d7a7aa75251cc54ba11ba2ccc606710b7eb
font_01_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 16808 bytes
SHA-256: d0e6249ef9bb178729ea66f4ddcb79666084631ff5dd7198cc19c71a93ae410f
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1