Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b754730ed4fd9ff…

MALICIOUS

PDF

86.8 KB Created: 2021-09-04 05:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45366f99c6624149705ab7951aa2c837 SHA-1: 0603bc6db0b00d6e61ad8b9c92c752b5fded53d0 SHA-256: 7b754730ed4fd9ff2047894f5159b8371e2144c2d764a1a235e681bf7ddb76e0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or tracking, further supporting a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=manuale+macrofotografia+pdf PDF link annotation
    • https://ddshower.com/ckfinder/userfiles/files/rapodatanajevupixedumuni.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/bimadobuneves.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086913dee115---nukavogusawam.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/duxovenesazopudepedix.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/legapeguzokufar.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/be64bb0b46f331b0ef95a2b7d2064514/fajarozomisuje.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/k91tnpdp7atl9fop20odq3ppm6/65970247833.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89619f381---67358181161.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210823135745.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/bemefatepelote.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/86415429764.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/25016264662.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e0deabd0db076c2f5ac911466d6e51cd/69883723590.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/fojuziperuketo.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/46791262748.pdfIn PDF document text
    • http://houselandia.ru/files/voxuniranexezobaxulamu.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/39706320495.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/9249616802.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/fezeragosi.pdfIn PDF document text
    • https://alutat.com/data/file/80011019967.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/d5dc9l0hn74hbl35v3q49933n6/zumopixalizimaxa.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f3839c2d---darorezesiviviw.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c087aaeb2244197feb70ac3ee5a0b0cd/528417049.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/xafezitisobobo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a63690dd82e---96793202596.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_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 10888 bytes
SHA-256: 93b81258cf2e0c10c1c796b60c93f91adb28152223b976cd3cd96477f4248bb5
font_02_sfnt_off00011fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 17588 bytes
SHA-256: 3137af63b19e2d0594de8230a260eee83b46ff7e9d7ca4ce19f7b47df2c0bfb6

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