Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7d032a512f92e4…

MALICIOUS

PDF

81.4 KB Created: 2021-07-30 22:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4f785b42d1e5e6e681386741f9d2489 SHA-1: 08cedea0c46851ba02e6c233cd30f42c816d1eac SHA-256: eb7d032a512f92e4ae80dc5fba7fdb0ef56ed8a402d2945e835147313cba713e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=prueba+de+entrada+de+matematica+para+primer+grado+de+secundaria PDF link annotation
    • http://aaronandanthony.com/userfiles/files/liferilapiza.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f20b14007---tuxaxoxoforixuxav.pdfIn PDF document text
    • https://angkagenap.com/contents//files/vinerezutenonuji.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/revabisagabu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ffc8c2261f8a37c62601dcb86a5eb3e7/kudazudimutugebur.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210713100117.pdfIn PDF document text
    • https://codecs.ro/images/file/3245731902.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1968de0aaeeae7662d4e5fcdd6669326/xedasiju.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5014796632---rawov.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/13384560061.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/19272957184.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad8eed70f---24543651645.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lanjsqoldk5ephobi6db81vhti/buvudo.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/60142554699.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/1l36fg9sira21s2ldeieeqgr27/juvevokumuwadukafumetol.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb1146cfb9---30352552858.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/bonivilefelivizexejo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160705436eae71---zuxekimiripoxenebog.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/muwesubanefedita.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/39190862756.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/774251db922245940d241e6982d5d544/voganowejorakimomitapum.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/jetagakus.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/62e8677116972d3e057bc4f532e8204e/32568165320.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783954e25bc---gijasanop.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/zivinojilu.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_off0000d53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 18224 bytes
SHA-256: a36a401b9f7c6fff7677d1e659a1e8fb78e5c8b75890087a6047a12312d7cfa9
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 11052 bytes
SHA-256: f13e95e12e31d9c312fc91e8707d332a7a1d2d5df8085f6863abbce4cb77f1df
font_02_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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