Malicious PDF — malware analysis report

Static analysis result for SHA-256 d229b5154cd24e84…

MALICIOUS

PDF

84.8 KB Created: 2021-07-07 00:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 687df2e72b822760e9afd6c898a64e91 SHA-1: 6fe281d16facfdf8a76f75d22f2a485c9721fa08 SHA-256: d229b5154cd24e84cd0c4dd006fb9202717bf5969a0ba275ee1c2c09634b40ad
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=warm+colors+vs+cool+colors+meaning PDF link annotation
    • http://ridendo.cz/files/file/mewemoj.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6891377717cf70fb11b71f20e1963ee6/8035581611.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/cfff659ef128f4742f696e32491dccfc/21262593117.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/mibobipozejor.pdfIn PDF document text
    • http://chinazzjx.com/d/files/xodeweziroxoxixuguruz.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/4043965240.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764bbef28f4---funoduxewod.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/jineboraworuwajaj.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/v4hdp9a10ghhjdhf9e5gl9s3se/kadugemewisago.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/wakutetelufipokudomizu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160960542ee08f---13893087526.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc402da8afe---repuvuj.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/ronavanotuwetowam.pdfIn PDF document text
    • http://come2menorca.com/images/file/99538174490.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af94c6078c7---wanimededemaku.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/fazewiz.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/4525419005.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1a4c7e1f6b4a25a9d12b36da1f6fb25a/57637263028.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085403b729d8---supuv.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f7178b4c---37426201911.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/77096366411.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/judotenedurikemifimi.pdfIn 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://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_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 16428 bytes
SHA-256: 71d8ae67db2ce51265cc29928b70245d1166305839985b6676a4f6a561a4aefc
font_01_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 10532 bytes
SHA-256: 548149cf471fc668bb337425415f9ae78e0c2bcccd08a4944a23cd56c45964e1