Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a49079a02291f9…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 00:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e8a8af4f1fc3dda41da3987b994f8543 SHA-1: 6dbbf929d514b35f703a9ba5c55c7766c1714544 SHA-256: 17a49079a02291f9cc19452f4850b90bcf72decba3ab7120cc4862700bd2b180
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, many of which host further PDFs. This suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to distributing further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ed60507531fb9c9f8e6cd008a8f40abd/4951880356.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b182f86d5c745b2bbe6e019d12d359bb/peburokekibasobubib.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/93124683295.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/betevaz.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2e7861ed---79621295112.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/83812d38ac9f0d6e35e305d77c6ca465/pasopomakewusezumonulot.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087a21597f30---jiboruved.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4a4a04b84ae2283c686fb8c2d3ce7c2d/jowade.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/bk399ipd2ut5ja2o4n0tjsn6e4/valamuga.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/62895955586.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a39d2699ed4---39994379810.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/zotoborofinavalijo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fddcde1f02---xizobivedo.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/16563439804.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/79649948196.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec46e8315---lijozamopona.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cca09744766---tikixubodepizemugugorug.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/imdsdrqnf2927pcp3mipci84he/dubof.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077149e57619---838068934.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076f78ccec60---liwiwifaxidaboxedup.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160da39e185eef---12545392537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=harry+potter+transformers+crossoverPDF 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_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 10676 bytes
SHA-256: 9fa0e1c20bdee405e23a1df93d9176dff4e9dc6df9cd4d7fed9f621b26415d63
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 17724 bytes
SHA-256: 9cc126efcd477f2917b8ff539c136ca13379742990a44728b3405972022e3b5c

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