Malicious PDF — malware analysis report

Static analysis result for SHA-256 536b580be356808f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 00:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93e30d0c1151e64cfa3e96850a0f1cd8 SHA-1: 7fa1daa12b438e5c928347a9283e376723bbdaa6 SHA-256: 536b580be356808f311c455b3be9cf6aa43d2c12cd92d23f6d004b1460b7301e
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. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or malware. The presence of external URIs and link farms strongly suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=importancia+de+la+administracion+de+inventarios+pdf PDF link annotation
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d156a467ff7c0082883bf16a71687e8a/98104951992.pdfIn PDF document text
    • http://proart.by/media/file/66110393916.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/1325454027.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f62c5b984156c66e13246e9f7f12c87e/36954279060.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/rewazopifodegim.pdfIn PDF document text
    • http://esangsok.com/upfile/files/60976663362.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e37386910591d105e472d164ccdac6ec/tuxujijikizunitukumer.pdfIn PDF document text
    • https://yuktogel.com/contents/files/30456417024.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/93049905821.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/74e73739b57f9b4e7be7dc2e04fb58ba/nezuwabamofebogebogu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160918436948b1---35328442199.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d102836bc---62739513883.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/bipepijo.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202108212138049565.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021082613202073499.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/joter.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af97ce40280---durinipagagumuwiku.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/64551356327.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a0024ea6c8ecf675ec6d5ce796404a52/tuzilugidewarikim.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/39174338517.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608742c79815d---relawidijigodofe.pdfIn PDF document text
    • 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_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 19004 bytes
SHA-256: 173595b4fee051425b8cf5f1688acc72c7f8fd5fb217c69823e7f16682d5dac2
font_02_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 10800 bytes
SHA-256: bc1f1bc1a55582bbbb7e1e5bb07483bba7cc1d49355575dbddee707750d5b7c5

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