Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6800cf4091510c…

MALICIOUS

PDF

90.9 KB Created: 2021-07-07 22:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5db6a099b04d88c29689326d7dd003b9 SHA-1: 06a62429b0021f3b84bddafeac512ad594f30739 SHA-256: 8b6800cf4091510c3dd934ccc8a8db593cbdc321b75ddc953e126f01f0be13ea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.bash.cl/media/file/kovewuv.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160832e595694d---pejimokumuwedamenalepu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/400dd21378a80ff40e25d9b5f20a5979/99226667354.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/8181708383.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e295373d4---73539445166.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0413e6624---37622833485.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/kawutupitetiwixopo.pdfIn PDF document text
    • http://nature-revive.org/files/file/xarelupopet.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160842a6e172ca---mufonavozijunaxeve.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/6417821567.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fd836a9f---25437698285.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0g0vrnucpsdt4gjglpok4ain5u/papowivipesigas.pdfIn PDF document text
    • https://digireg.dk/upload/kosiwazuxakimenepofe.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/fudavojapekizu.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d55bfcf0735---wifagapabipu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/214e7708961ea7c0003d8563b08b925b/migijuguxiti.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3op6p9oa08o712pdedk7v82e5m/fikorelip.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/18787725525.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/ba2cb09090209d24fc82e0520c3c8b25/83682605715.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/vajeberupo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e419fde8bc2b575539c56f023b5a880d/danadaw.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6c3c65249371d6b414c2d649044784fb/33674726154.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f0c840dc---1853752579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=desired+compensation+answerPDF 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_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 10716 bytes
SHA-256: 0381f1bf44f7313fba4b5ebc7382bfbb57c7bf6c779aef1a9bd18aaac82f69f0
font_01_sfnt_off000116ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EC 17624 bytes
SHA-256: 1a3985e8bab86063b8757707fa9e47fab15c51b144b4e837b62008c77119ca22
font_02_sfnt_off000144de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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