Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5130f2c6f5513e3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 23:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 529c7a4239c2b3180865b4a7bf4a475a SHA-1: 8851c50e54f1dfbf7385dd6d419c57c8ab91c8b6 SHA-256: d5130f2c6f5513e30f20ef120eade14c27ebdd22ca110d2e30986ac67f24836c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links pointing to compromised CMS upload storage and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The primary function appears to be directing users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://infrive.ru/uplcv?utm_term=life+cycle+of+electronic+records+pdf PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d92c0e3f0---66953219977.pdfIn PDF document text
    • http://boxethai38.com/upload/file/5482181225.pdfIn PDF document text
    • https://terracell.pt/images/file/kazidaxodoze.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/nawufa.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/firimelafurigadurewibe.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/72835036475.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe83cc4a1f---latomijajobifasuguxodun.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/24103946871.pdfIn PDF document text
    • http://trivio.it/userfiles/files/59958342594.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/utqps0jjudvvmg4mk733hmuu7f/dofoxis.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/penutoja.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a161181380---6959460547.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af918fe8352---rukatovewapuxupawusojop.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/553412a3d948bd8f3bc5fe16a0cf7d4b/57966162118.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb603c23fb---bigux.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/50f10f57b422c4c6f9cdb3a1f4580939/49795595419.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/wafebifepu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d59693f983bf944cad5641b1bf78a24b/mupalenekapudezuwa.pdfIn PDF document text
    • https://petek.biz/resimler/files/maxewa.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/407tj9r3qi2j692adga84vg0t2/rujexozifolozimojufusezig.pdfIn PDF document text
    • http://azizolace.cz/images/file/67536764217.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/tafagixadasixepekidaxugaw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 17588 bytes
SHA-256: 99cb1ed6bbe3e5826661d0c05a517f57034442fdd1bffb9a30d5da43c9674943
font_01_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 1872 bytes
SHA-256: 79be395588af96fa5df472893822587051e439780fb3f760348c77be68f22830
font_03_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 10524 bytes
SHA-256: 066303d5a8eb47dd3c26fa55a3552d2d24e190c87d09b8f33bbf13630bd1fde1

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