Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bd84c2af578ec4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 03:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8e27a9c2d83ca076965177588d921b0 SHA-1: 3efc7fd4f59c62e83b543666d798b78a39408ff4 SHA-256: e5bd84c2af578ec4828d081e5dbc330fa2fe89705c30a819078553db36e531bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86958319b---pajetelaxisonusilepo.pdf In PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/guzulafunelarepomude.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/19635545723.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/28719495047.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a159d7514a---nadaginades.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/venigokenetezutozitabo.pdfIn PDF document text
    • http://trieuduong.com/images/Download/rulaludenizubalu.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/65128679381.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/bemexamokovomisor.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210906_8B6D0B5B1B9930F5.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/sikubupugubex.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/bopaduzowatepiwibomutopos.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/cdb1086ffd9bd7eea3b29e57106b1562/97239057613.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/vabebegisoka.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/juleke.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/matoxejep.pdfIn PDF document text
    • http://cochemical.com/upload/files/menonojosiwiwupunij.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb14ed69c---68865532561.pdfIn PDF document text
    • http://soc-in.com/data/media/files/betubabipesibeviw.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/31327893124.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/mumivuxiv.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/48236816541.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/wunivod.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/63592864666.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/molupizujagam.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/miwuniwibiroxiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=god+live+wallpaper+downloadPDF 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_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 18284 bytes
SHA-256: 5e4e55bd20f7512cd64a4cbb75245bf000dc8f0c497db4be0d6b4d4d3712dc75
font_01_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 10312 bytes
SHA-256: 2c553cb6e11a4d515a0709a4cbe2a6e5eb89b359cca7b3eee5f70c72810f1fb1
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1