Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20d6187eda1178c…

MALICIOUS

PDF

82.0 KB Created: 2021-10-05 00:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c564f6803b0e81861c52369a60d8b9d SHA-1: 8d99e42ac793722d1083ff45f97937bad81eaea5 SHA-256: f20d6187eda1178c7a1aabe9295ac48637c20c1638ce1f618304c2e44dd2b1bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=properties+of+addition+subtraction+multiplication+and+division PDF link annotation
    • http://devveb.net/userfiles/file/28876095810.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/seregewuwifajolupesedaj.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/32842169076.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/28051768124.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/vetufudusupodori.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/natusafizipijilazog.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/budolekowedaxop.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/3559861290.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/mevenebozakokixot.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/53030138250.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/gakedirit.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/kugita.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/furogatapidokomopuzo.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/fanik.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/57945f4f06bf99d8965e27b8f6c27a70/68595875091.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/357835076.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16158106f04146---33472042410.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/lonotunizolejosoruba.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/detaxa.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/madibajatul.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/81037854441.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/zowuliripotozudebuzi.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/lafaxijag.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/72572188382.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6de289c8---kaxaxejototub.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/97210723263.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/80847121025.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_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 11088 bytes
SHA-256: 8ab5850c8d698c01e822cee40b794da76fb5498e95a251505f90f90841fdf4e7
font_01_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 18644 bytes
SHA-256: 603200a06554fb051e6322e0aba1d51035e34bc8156f12414bb893cd483dd5d7

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