Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb91114eda6d3fe…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 09:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5a830a980d86b9966b36723599536e6 SHA-1: b0415e6a9e4222a2097da775f462809fafa96499 SHA-256: fdb91114eda6d3fe3567d8f7c471dbd9b7662f93bf42e30a9e36cc0faa9de5d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/340231f54259d1b859deea7bd6bb8fd5/56254658808.pdf In PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/54213377581.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409f638b079---54918876154.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/23789310158.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109151649284439.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161409075b84ac---puvabisuxiwagan.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/56026901455.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613846455448f---sefuw.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/82177277798.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/47106891294.pdfIn PDF document text
    • https://nomortiga.com/contents/files/52304974131.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/lemijewekumixixusuwelep.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/72341531629.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136002621b7a---16970817517.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/ketetibataxer.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/53323258656.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/86615520206.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///48034836987.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/64973285725.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/bunakog.pdfIn PDF document text
    • http://usagimatur.com/files/others/fafumumija.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136c638836a2---minamol.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/mumezekoluvemumobogagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=watch+us+shows+online+freePDF 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_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 10612 bytes
SHA-256: 36207484153e57bf647e0ca5091ac5738e4bf22b2dcab59a12e98c7799788acd
font_01_sfnt_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 18536 bytes
SHA-256: bce6ba5ede044a0b18eb7178a5d1cf49112a4eedfe5d489d7f05cb36d58864f9

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