Malicious PDF — malware analysis report

Static analysis result for SHA-256 b420bfbe1760b6b8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-28 10:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8779a706ad2b7cb16e47c0f6de471c9f SHA-1: 9bfaa20bc11c534694bfbe67271677c1f5342704 SHA-256: b420bfbe1760b6b8979355561dbb7f8b9f6a1be2002964dd46e7e4fc4ad4ac7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs suggest an attempt to manipulate search engine results or lead users to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=main+character+of+sword+art+online PDF link annotation
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/padivamefa.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0dd0339e3---damagafazatuluti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379f5a1ae2d---22691981273.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f2138612---tekenezo.pdfIn PDF document text
    • http://sushi-belovo.ru/files/38833456048.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/jevuvegarenebujir.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/66293989884.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/golezoxanuxip.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/jikajonik.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/9062274436.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/rogem.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/22119358521.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/figifipogobigew.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/nifujololitugemafema.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/torivepe.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/moxiduvigowa.pdfIn PDF document text
    • http://infunplastic.com/d/files/nomamotal.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/44666867844.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da2dcd9028---zijojakinibosu.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/39879341029.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614930110c028---80925301405.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/wuremewupanare.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/dokowubeligexaguwo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6f4b5c4d---11250592550.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/zazelamiw.pdfIn PDF document text
    • http://freewest.at/wusewufudujozoni.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_off0000c4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C1 21156 bytes
SHA-256: 985ebaabd022a1d626f4e19c07c99320b9d512e9a74dfd2acddccc28a03c7755
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 10652 bytes
SHA-256: 69a51659fa2fb292258d149ca55a14a3de84e8c2dbbefdfe8cad88ad25c9a156
font_02_sfnt_off00011409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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