Malicious PDF — malware analysis report

Static analysis result for SHA-256 d890f8f1388cbe18…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 23:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 271d3fe230601e9771c054517f4036c0 SHA-1: 6ac85960b79c97ff1d7b2a2cc48112bcc1815c31 SHA-256: d890f8f1388cbe18cf295b8e7f281a9c28c633c32420ff53c254a27f021fbb31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, some of which are hosted on WordPress upload storage. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a tactic to distribute malicious content or phishing lures through a network of seemingly unrelated domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/i0450dhs300d1lbldebqmohro1/83348824294.pdf In PDF document text
    • http://cortabellanews.com/userimages/72566080520.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ec0afc4aaa0490aec7c052c242b60458/batisananag.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/zavabetesofenu.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/fakigu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608445ddd31d8---tojutenesosusopevazadus.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/607a21cbee0f1263e79fa38a822bcfa1/55221166976.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/saniwopevokabinoxalu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/75f7148369a8160319a5d9026184cf12/20798432137.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/tosiwelatupaso.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb623a851c---povipazimiwofabi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c708d9f18ec---64498231134.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/kawezidupajedaxixozanuru.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fa715bde6d1eb09ac176e5f91b371419/27716456188.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/sinodabuvododetu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829f63a8bb8---fosamasefajibesafab.pdfIn PDF document text
    • http://robbes.nl/media/files/71589081956.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/savebafesojotegoxinado.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160954d87a9a56---80379202516.pdfIn PDF document text
    • http://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/71566352235.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608471ef5f6b0---29853547282.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/24017721222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=liron+yanconsky+how+to+sketch+pdfPDF link annotation
    • 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_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 20044 bytes
SHA-256: 4450fdf2b2f51e8a772e9fe7354603e3b8caf3beb9ed62ed33499446c21f0b60
font_01_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 10920 bytes
SHA-256: bade4b40c51c0f6d990ac498c691659e16bb0d7e4b80ee534398dde01df80476

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