Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d0de7646f6272b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 02:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44bb5ac09ef254031513859c8dcd1d3f SHA-1: d32cacc79f6d0ef3914c21f140d505f0ddb8c6f8 SHA-256: 27d0de7646f6272b05ec08aef5809303e3409b94eea03d95c1fc0997b0b11dbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to numerous unknown and potentially compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/lisataduwowowovimeb.pdf In PDF document text
    • http://fantasymusic.it/userfiles/files/69913078683.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/bivabofufad.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/63170595118.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14827a0fb---73472749353.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/lujudume.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/fujifujufimifelopu.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36d06b85ff---94106174700.pdfIn PDF document text
    • http://atya.eu/files/file/pivanedujirabijunuvelak.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/28134457184.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1ce22e14---75238975940.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/fb5509b72ee4852bf5959cb5b31e4907/jetumosexekitoxolifobene.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cdb1d881f---gepun.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83cb55f7a7---53988347450.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gfq92pb7h8rt3a4q9nod6v635c/wejekamozuwatogajaja.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/48056396097.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/kedazutedifobid.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///dajed.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6052e2b4b5---8681799174.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/64643628225.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893c74110eb---dunifitigomu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd34f7e587---24364548290.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/81240157834.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/85446286895.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/nojixidileme.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/546197161.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/jonedikar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=radiology+policy+and+procedure+manualPDF 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_off0000c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 10848 bytes
SHA-256: 8f3a81913e5badfad810006ff10246f9376dbf1bbe554a7f4af8f984156e83da
font_01_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 17452 bytes
SHA-256: 701d425199ec60c61a97101684c0ab1c57b49f6c556d1f4981df8f0bc2be9670