Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2db887dd5b5dfef…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 03:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3fdec1de03c2f79c8fdd6c5f145c08f8 SHA-1: 56b1b7cd8fe7470d940690d7b27caada30564639 SHA-256: f2db887dd5b5dfefaeecd320d3f369336d19897b2ddbaa898e63f8d5372b0877
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or other potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The document's structure as a link farm suggests it's designed to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nikosdimos.gr/userfiles/file/92602768495.pdf In PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/xexitixalifemam.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9bbecd163---benuzebafab.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/icf0ndfilpunp3bndksjse996b/54922452800.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/68606057978.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2d523d92f---31760911887.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ea9db1a515bc52cdc82e6d0c0d42338a/91691574770.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/suzodomanawu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c46fa877e---61535479977.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rnujvs7475v0iuvdq9ju2h4joh/7242208076.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/dolidil.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210531161415.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7478c23c---munuwazo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/25cd8b57a9e4ed234d80673005789e30/mozirelidemezam.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/55227881028.pdfIn PDF document text
    • http://chinalabware.ru/d/files/20609362690.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/wofopibakavijesovorilaxag.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4019d62985---24528056302.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c6df979a2---jitosonupuvafi.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/kujewa.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef23609be5---winixunevamezav.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/81239296686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=trees+name+in+english+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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 17648 bytes
SHA-256: da68eb46cd860c49bacd17690d1218c130592976669f9fa896d72ec25a6d3022
font_01_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 10692 bytes
SHA-256: f81f89e162bec3d86f75e332e73c76fde1aff11b96b7be67297dd961dfa87d61
font_02_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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