Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1e331356d554b3…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 23:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a660f10712011dc0217251e0b9d75c68 SHA-1: 8e9beaed746325527eb7aab11913e0849dc80b00 SHA-256: 3e1e331356d554b3f71a150922fed9f428d33f60a6278ff1e38b355066f83bc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The document body is heavily obfuscated, preventing analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/80583db3c42ba710de15ce435be83fa8/watuwagefepetam.pdf
    • http://vijyaiprismcrm.com/userfiles/files/97841937531.pdf
    • http://lws-realestate.com/userfiles/files/17781296624.pdf
    • http://diysmart.net/userfiles/file/lufuwe.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/bf522e83a68db006d2a46ec35cb35b71/45377496935.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076e07574821---wurexotakixerajusumawafa.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ecef54cb14c278d8a30115b2f0018d7a/80534330507.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f5bcbf6ec27b9d480b6b479e2872ab8f/22789079892.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/455648606a8f5c437cee94c99b0a428f/duboxibozavujamanoxilari.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0261579d7---fisofowibobej.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/dugozebelemekarinom.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/0f0929d0e94d009205c6e920a3c23c11/pifefesufuranavolonu.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4ed5fbaa---60717057046.pdf
    • http://hanboo.cn/Uploads/file/2021062905003970554.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3908l2rgfv7emm9arv0jrrqhud/34660543631.pdf
    • http://absolutelyneon.com/userfiles/file/13896489890.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e25c6b6bb8b54a9d68be42a163dd9e8b/23402099057.pdf
    • https://mimpiindah1.com/contents//files/luravexux.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-6-22/20210622155724959486.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/s8adg03oitcpu8r072p0p35682/30632253499.pdf
    • http://turatabor.hu/media/19370303212.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4dd3399f5---bopatot.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/cb2f8abf844a96c77530150a3757d9c6/xikenapatovosavozu.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608320ed8a4d5---koferukid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=play+school+set+up+cost
    • 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_off0000eb7a.bin
73df1aca86c9003135c41b63dd63076e887123ffee6f8b2a1ff5e32587633ace
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 16428 bytes
font_01_sfnt_off00011619.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 16792 bytes
font_02_sfnt_off00012e30.bin
04258bd7c59b47cc788b46ab8b103c6416ef593ff95e2a68c68f4a133aa72e15
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E30 10392 bytes