Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd1b9b9eb134305…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 07:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82446edadedd88cf629dfd8d0c6939df SHA-1: 20020846f7e946ad63cc7f3a0aae1889b7aa6050 SHA-256: 3dd1b9b9eb134305e56198f9bc0926f23d47ecec6f30542968fa8bfa53189cd2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to link farms on disposable hosting or compromised CMS upload directories, suggesting a phishing or redirection scheme. The PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://fashioneducation.ru/userfiles/file/mijuxexowademirober.pdf In PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/jizivanite.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/54129763505.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kobaniwig.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/81637850320.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/54855523966.pdfIn PDF document text
    • http://freewest.at/jazugida.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/barujex.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/buwubasiruwenuwopevabebof.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613417bb425b9---matopodubukagulepuga.pdfIn PDF document text
    • http://fullx.net/files/81820048845.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/kekimub.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9e82f271---nitulo.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/tunukajovuwepopefemabiwow.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/garopidobuw.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b8f4b2e5889ecf2200dcf1841f312ac4/6519595526.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bivedotizububevi.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/72390104901.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/87352171272.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/bcb6b471018ba31c1cbc8c652008482e/zowililejoxaralo.pdfIn PDF document text
    • http://vaynhe.com/upload/files/rafemufikodiriwa.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/winizob.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/75087545657.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/78930270191.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/16623631398.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/42044735963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=earn+to+die+2+online+gamePDF 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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 10524 bytes
SHA-256: 65c8df612b675befbbe12838c236cd15696113bd380cad2a71ad70638c1ecea3
font_02_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 17372 bytes
SHA-256: 82bd667689fc68fc135779c269c26f4b8b2a7c9d3d6564c3d0b1a52d2196dc03

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