Malicious PDF — malware analysis report

Static analysis result for SHA-256 5565aa0026b7f28b…

MALICIOUS

PDF

97.8 KB Created: 2021-09-04 20:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 57762fadc4d451d635673388f70885da SHA-1: d7d7fff2f504fc4af72246b471e698bee526b9b5 SHA-256: 5565aa0026b7f28b084cc739fa7651246494e88eaa34c31ff3d36ae945a5dc74
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 functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple compromised CMS upload links and disposable hosting domains suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=focos+de+auscultacion+cardiaca+y+pulmonar+pdf PDF link annotation
    • http://aromaonly1.com/yamituki-n/uploads/files/pakiterujeximag.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/59244412004.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210821_A24049A80A04784D.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cde9c95e---44623704334.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/18071771988.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bef22f43f---7542260981.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7f845ea871be5187f93bd2a42060cfe7/27397270751.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/86392643326.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/29803947671.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0fb62669e---79177269560.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/pewon.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/xirirevowusokibibezeset.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/newixabuwavasavimup.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/lanixenakumix.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/fasisitepevajikodujoz.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/33777709668.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/dumejokepozuvosatuzijuru.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb25ad791---18829918408.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/27156175127.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/75sk0mr5kj35ndq6oqtlaquiu4/91688600834.pdfIn PDF document text
    • http://m2m2design.com/userfiles/seluvawipa.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/93843596573.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/roxanomonudodipulebusoju.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_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 18924 bytes
SHA-256: 472d7f611455900b5b157ac64477d5a3534b60555fa23c57ad55800026194b43
font_01_sfnt_off00014620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E37 10972 bytes
SHA-256: 307e4b96be319aa32d28562807e9cdbb817d7747dedc1f4ede126f0cdd1d3f41

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