Malicious PDF — malware analysis report

Static analysis result for SHA-256 47074fa8af5ff57f…

MALICIOUS

PDF

80.4 KB Created: 2021-07-01 12:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 51c9cf84ed7feb4386be5a43cb035e81 SHA-1: 9dc97b36ef0ad0e1b2efc7699ec7587450ff55ff SHA-256: 47074fa8af5ff57f7a868bf4e52c3a7c7279491f81dfb639fa46508583fe402c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified as a link farm. Heuristics indicate these links are hosted on disposable domains and potentially compromised CMS upload storage, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification confirm the malicious nature of the PDF.

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://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608872c244fea---10218378965.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45ababc79---51940587578.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b3361cd4---nipolemobudanenepej.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/15033334085.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/27976611924.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887ff652f1b---watalodipotixagati.pdfIn PDF document text
    • https://banghenails.com/upload/file/vetivekuxudakov.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c6838bd0---xasovu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607322cf89262---48896583024.pdfIn PDF document text
    • https://baongochoa.com/upload/file/pugogujekaxeruwixuvupado.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/41510499161.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e64f68a086---13093380259.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2ddf25e5be8ac94e55218510939b5e1a/jesupimob.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d83d5974a0e46b4036cbc6397218f19a/tifuwexafegidubivafuliraw.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b397c02a67d---30531113548.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106180204553569.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e77a069678a4343a0165818b9ff3dd9c/91545803141.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/c8rdg7rclh83p7vkqddeps9iec/nupogosilupiz.pdfIn PDF document text
    • https://orangerun.re/photo/files/73063302716.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/wadopejogawarexodufotexi.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/xukidejep.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a9f6029bdb47ab6127a9993a926985ed/xolazopagudokiziferinudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chemistry+for+degree+students+pdf+downloadPDF 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_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 17200 bytes
SHA-256: cd23a8efea180eb7dae233563e5ae8dc7d04cb55430361d5283fb9e16feb13e0
font_01_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 11276 bytes
SHA-256: 3424273ce1194085017da5ca5afb7ebd6e3a9dbc7d4a04ce7df92d0122faee72

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