Malicious PDF — malware analysis report

Static analysis result for SHA-256 670a02a5ca1b80b8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 16:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22127f48610f8a89a8ffab85944c1435 SHA-1: cfb78fe92ccbfb29c8372484c5f587d2bd09669e SHA-256: 670a02a5ca1b80b8d565edb7e12a22a926b661619a9b6c0cb187c2141be9fdc7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alkalacarservice.com/public_html/userfiles/file/jotizudobo.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/20cbaf1a2c9d4c4a3dc1bb7db277d528/puzarudiv.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/181936202460f3fcba00022.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/39479563931.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c180ec852f3---femizuxeginusojak.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121d62a3961e---61361884982.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/lujepiratogewaniluji.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/kupalibofapefejirexibivug.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/93697299440.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/poseje.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/796b342bcbbbabb0524e080b9c03fbde/fosolesexuzijukepisul.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612174ca6659f---lawurirav.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/88801876393.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e0608986---lixajalugajesekinoverak.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/05f7114e96c61effdb9ed117c2f697f9/gojipifatefuxogupezewuze.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2034504a42e5e316c3a43f226c6c1f20/67259721013.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd873f6c8---63964746143.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/31068764219.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/59699517184.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/36365566547.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4279d899f5---rabiduvubilu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/si20petea8nrq9nn7u2a247pc7/24353341181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bhopal+gas+tragedy+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 10748 bytes
SHA-256: 6b69c0886cbeb727537fcebc17937617312b8ab18647bb1a20c9f76302950628
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 18208 bytes
SHA-256: 46ccefccf175a7c10a4c61a3e80edcb8136b37fe74576876b16a3012d8a78399
font_02_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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