Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc72170b3ba8dba1…

MALICIOUS

PDF

99.2 KB Created: 2021-06-09 15:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e04f63bba5c31332f3b15e523f0efeaa SHA-1: e27427a57f171c8fbdb51b654c7c69f9138fda5e SHA-256: dc72170b3ba8dba18ac900a8edb1600b0e03d5d5aa03d8389a48d8caeb7d8df8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/uplcv?utm_term=class+11+physics+notes+with+derivations PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a19ebefbc4d9a397386d683a4a7ec6f5/24948455165.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/24912134677.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/53823990890.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/77b267d2f47eb9dac7d405484af04f36/guvipopeg.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/vulosewalajoke.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8244baef9---midivekovomuwaxonid.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a109d1f67c---kurunizugasedebop.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ebabcd6256a461195c9d058b5536124a/wugitirisogimibiz.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c6c55e0dafa39d16658e179224f91597/tevilaxavo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d1e5c510244df7558e57612d537e3c20/vatubuvav.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ad7d3e08---36981674435.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/67727302563.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/pukaw.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/96cd9cf0690c9d37262f39b4345fdf7b/jukelo.pdfIn PDF document text
    • http://texmet.pl/userimages/file/74866481290.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098e540edf13---4568695710.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/43242105711.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f37f7cbbf5d3a0e69b92707463cb27db/99549355123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off00012e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E42 5372 bytes
SHA-256: 69bdcda5990469f77bbec6d4fa86fdcd608c504a0dd936610189dda366b3222c
font_01_sfnt_off0001409d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409D 12064 bytes
SHA-256: 9cb173120b540c86b1e42526fad86530fd3cc08d7aa39813db74c837d4fee9de
font_02_sfnt_off00016a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A03 16192 bytes
SHA-256: f7c959ef3840947929b2fbf21a6f844c3d2ba9157ff04f9c13ff486e75cc34e4

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