Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b37b66e2ad834fe…

MALICIOUS

PDF

93.5 KB Created: 2021-08-15 23:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1b92dbdc51fef5c925a82bd3cd2cd81c SHA-1: 61c4732d0947b4fa38fe831db3c9b00e27141b14 SHA-256: 0b37b66e2ad834fec247d4165b5fd8fda41cbc56a25129eaf974e95bd4e6a884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm hosted on compromised WordPress sites, designed to redirect users to various PDF files. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the ultimate destination and potentially phish for information or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875cb7a249---degatijafom.pdf In PDF document text
    • http://historia-bfured.hu/userfiles/file/58422329771.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093636c9d84e---gekuxanitafamorez.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/73270063428.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/11833049490.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/mareni.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/18771720998.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/71jtnm16kl2tgongfvoru4tmk7/84438541826.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/lawaraniga.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b86d3631094c6a2fe51a08f950c23f69/jajupenobixatasikafo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/pulr39d7m98t4jee1vgunl76um/340504124.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4f5f1d528e380fa3ea4c34afc9c2f317/53269608344.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/62133384128.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2c3e9e00f7c045aa864a868caac8e486/60740612703.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a984c2a4be1---nidirusakesevoxez.pdfIn PDF document text
    • http://aven.su/userfiles/file/mukibebibefisag.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8d9022caf800af4a421117a06b6c3df/vorunuvu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789f603f8ee---jonibupavazusulerijutej.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f11jbnu3tedll0pnrm22pd2u73/fovifobuv.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/pixafikunetebomanugaker.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/49aef78f2d334951a5986b47c66e1957/jufirude.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/fagefavalumejuzevejiwu.pdfIn PDF document text
    • http://camelliafb.com/uploads//files/202108051002324125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=simeon+panda+workout+pdfPDF 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_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 17724 bytes
SHA-256: b28e9a2ed8d5c04ffdc193e829656385c336f06f6e96baf751474b1bdc84c43f
font_01_sfnt_off000136d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 10796 bytes
SHA-256: 271a33183545653caac6afade8fe260dd126e83b43e902263e8f9a3cc3ff43e5
font_02_sfnt_off00014fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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