Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e6bf510667878f…

MALICIOUS

PDF

73.8 KB Created: 2021-09-24 15:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b49e9425f43fc9472497e4170a9842cb SHA-1: af0b1fc837eacd766410d25c7eb2cfc0676702f9 SHA-256: f2e6bf510667878fdd574c1253c9bab952e90c3ee27279c9c94cccaaf649adf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, likely attempting to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://smidgel.ru/uplcv?utm_term=george+orwell+1984+pdf+download PDF link annotation
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/13592947637.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/bexumilatavewute.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/virebuwuzaminunopenotunir.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614521586f95b---97988554907.pdfIn PDF document text
    • http://asqcert.net/files/files/36613846792.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16145a115f28d7---22341804026.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/gikunazimagakalisu.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/41552040245.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d89a53f9a9---ditedexe.pdfIn PDF document text
    • http://bociany.sk/media/file/getevogakaf.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/76245968043.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/juzufelososilagumejusa.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/nitilabipoxelodasuxesi.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/zupimomajogidosijuwe.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/jugubumisasatavir.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-3/20210903202827831975.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b586f495fe---98308464560.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b365a378e---tiwakerune.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/92494418295.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/sawunalokapuledukera.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/xukefep.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/92005898247.pdfIn PDF document text
    • http://cycling-software.com/files/file/betubawipu.pdfIn PDF document text
    • https://fac.apuntoweb.com/userfiles/files/talonusifililoru.pdfIn PDF document text
    • https://klaipeda.cvzona.lt/resources/img/files/goginowulodawen.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/81292677365.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/6519292308.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_off0000b9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A2 17784 bytes
SHA-256: 2b904008b2b94d2b8adfb576e1e63fbf5d618056699dfedae84d6495fd058dd5
font_01_sfnt_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 10948 bytes
SHA-256: 0ffa42585b3f230f5cd311b81985dcae1eb6eba9f61e000237f30a8cf07a74de