Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccb9c37942dc907…

MALICIOUS

PDF

72.7 KB Created: 2021-08-30 10:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e03860608c5c8097707dd87d8ff34fe6 SHA-1: 1c72c998dfe64d12d46f1a6deb42b02fc75defdf SHA-256: 5ccb9c37942dc90704864696ab553c6e79a4c3420972e0ddc0ee80879a3d0ca2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adafa632d91---50700858000.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e450feaba80---boxobizizuwazujuvenenu.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/84gcor03djvqq2plbpjniuns83/2966750877.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17d05c64a---duvesenusu.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78fa9bc63---17868630486.pdf
    • http://aci-immobilier-douai.fr/userfiles/files/navibudegavi.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/4pb2jpi7h2ds7sukq4ut5qlk84/jutafadamebusora.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/jesomexorurekizuf.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fb6588b8---18986124507.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/fd4920cac71b986056b82cd33a39863a/galax.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fafdbd540bb---51998001570.pdf
    • https://ikima.fr/uploads/file/4937480121.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/nipeluxukubutefubokaneba.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2fd662556a61ee3972d250f0178d8235/sabodagojixoxoworari.pdf
    • http://anchor-m.com/js/upload/files/10904184086.pdf
    • http://lecostationery.com/files/file/1880287741.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e955ea29f4---topanasebolalaladafiseli.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160880767bb5ed---panujatusalesupego.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7fa6e8e99---pojiperuwilevuge.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/36098248413.pdf
    • http://impex-italia.it/userfiles/files/xewalenipawodawiliz.pdf
    • https://ludifrance.fr/userfiles/file/luturotetelakexo.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c5635406---41714233338.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607033b7ce00d---muwaliwif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+time+do+you+get+up
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb1e.bin
df390974921c3bbbe75f4ac8095b25af2fb2ca68caee873e1adfa829acc38a23
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1E 10628 bytes
font_01_sfnt_off0000d341.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 16792 bytes
font_02_sfnt_off0000eb53.bin
50cf8f7c3666bc8db7ee8592eeb3382629af7af64840fffa8de2a029b5173b83
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 15908 bytes