Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c25b54b515e3b01…

MALICIOUS

PDF

87.9 KB Created: 2021-07-20 18:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fd6388e69797143f7bdfd66f40c264f SHA-1: 9ef642fc925cdf5531a2c30f98592a6062790d88 SHA-256: 9c25b54b515e3b0134d02f06824b7cc1c8c4afd7acf50fdb3eea2f6dfa36b15d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous embedded links, many of which point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The presence of an IP address literal in one of the URIs further increases suspicion. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://binarbaid.com/public_html/userfiles/file/22806504260.pdf In PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e531868ef---26783580794.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2bd6552e73bd3379c9458930336a5d66/391079444.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/b53787021283be65edc14dea7385e3f7/xogejoduzuwuwuwuduletom.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dcaada5d6---65440070469.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/mukupisete.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/32i9dpdocu16jf0cf7rkhe7as9/keteroliruxiko.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/92244565993.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/49598390634.pdfPDF link annotation
    • http://opuspointpartner.com/ckfinder/userfiles/files/movitofafazevopevudobaziw.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-20/images/files/rimixediwub.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/poketope.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b6beeac4---gepelig.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/0ebf4c4a0a16e20a4311e930abbf20a5/43918801815.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/52ece264c9adddc725ee1103867b821b/fofimerovibufalojomazupu.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/45518433253.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da13d34e1b---ruduvakozolibo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719aa8ce02b---91544639845.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/31c7770bfad3c6e3adfe6a69b79f98fd/dotutatebes.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c7d6e426---61985298991.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdfee7acc0---68014441804.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/bakuzuwekatawu.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/16661304891.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55417a038---wilufukubatewusivelip.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/dojamixiwoniromobexizur.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/11a61d0a22269a70e231e77ff90761b1/96077620007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=signs+of+autism+in+babiesPDF 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_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 10724 bytes
SHA-256: 26e12d7d4363b8948e6318482fedee6b171b267182a32374d631a21abd547ad3
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 16912 bytes
SHA-256: cb306676885f5d77537e648ff2d6d0eb8d1b16120fe9b4c450ac680c687d1b21

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