Malicious PDF — malware analysis report

Static analysis result for SHA-256 2313792a6e5130dd…

MALICIOUS

PDF

91.3 KB Created: 2021-10-23 15:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: abdb10363e35d99afee6cdcf9e70e655 SHA-1: b3ccf450ed260e1d71e1325414de3992e9fc4bd6 SHA-256: 2313792a6e5130dd0117c99ef38d0b84226d10ef4c447d3906a74ed01044469b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious link distribution scheme. The PDF contains an embedded JavaScript stream and numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. The presence of a link farm with UTM parameters further supports a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://krisoc.ru/uplcv?utm_term=best+full+body+workout+for+mass PDF link annotation
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161332485abdff---39401345853.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/dedatejalel.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/76678753145.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/wozibodoxamitemipadivef.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/jozupenapurudegifija.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/93207956953.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/tijozi.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/labitavesaginapo.pdfIn PDF document text
    • http://dentherapia.hu/files/file/muvovurogopet.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/depalazugilixogunok.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1615b00eb2d964---47104225930.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/bofozofilu.pdfIn PDF document text
    • http://220-wm01.netdbhosting.com/file/21413316541.pdfIn PDF document text
    • https://stormester.no/files/file/vobiwegezijes.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/56201508342.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/2441817380.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616e947860e10---48385350433.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/41072573698.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/ramunexevarovoromirusile.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/jabodezavutiw.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4057e19860a84a296c244bc8e7073920/5641188907.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202110081646117632.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/60989761139.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/98248159291.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/29686487399.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_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 10904 bytes
SHA-256: d6324912b90a13c7c9d31f091bdcfe2de0de7c5c361094034dbda7467346e067
font_02_sfnt_off00013456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13456 16720 bytes
SHA-256: 0ab46bbe5e00bec5426aa89841820c7a677546bd831d1868637764390bafb9c1

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