Malicious PDF — malware analysis report

Static analysis result for SHA-256 40011d616baee4c8…

MALICIOUS

PDF

73.8 KB Created: 2021-06-30 20:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9be6992f31612cfb0f34ebcb32e2610e SHA-1: 1d1b5aacc8541d1d05ce0a0deb8c111d1e80da97 SHA-256: 40011d616baee4c8806b47f6ea70fcaebd0b0a71f97a25b97e8447aa1452d5a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted from this sample, but the URL structure and heuristic firings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://csodamalom.hu/files/files/13985599139.pdf In PDF document text
    • http://maszyny.pl/userfiles/file/21129596686.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/82008824858.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5e500ce0e220edcf9503656f03f4b3ab/govedogijetunarixigevixo.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/86222929977.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/bd7ccca6551dc2ed57e23b91bcdf84fc/vetoxanugubogipogojisu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ff056e8a240e5771cdbc68168472e8fd/13321518759.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/5008041542.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/40757297073.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608208f367dde---momozikugagezup.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/22139114392.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/fofaximatiwavofulovunoxe.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/66021496649.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c59caa5c9---14332557219.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wibojonuxufin.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb70530696---98860112553.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a27525946fd---44585841052.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/igfcscg5a72r2jgesgpb0qc904/54712341138.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9b1785ffb84aebc1564bd2a1fc258299/pejudasokodiwiwukepesiwa.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8f4d67a8259ee813432a51601c5219da/masefudikaforofozupebugi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/tjg5ipjpjvqead8k0mjca8115e/sijagoxakanewunijetuz.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a118547a40b---sogufakamogupujedebed.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/kababajalelivituvexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=harry+styles+coloring+book+pdfPDF 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_off0000b967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB967 17488 bytes
SHA-256: 5a5dea19364526819102ef7d637ff38d7997269b96868abafc26141975eca759
font_01_sfnt_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 11132 bytes
SHA-256: 9c7b7d4ed07e234fbf07b938dad5940f683049cb002094d2601c2f2a93d91ec4
font_02_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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