Malicious PDF — malware analysis report

Static analysis result for SHA-256 30bf679b903e314c…

MALICIOUS

PDF

73.8 KB Created: 2021-10-09 04:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c59e05a63422b93e1d42025eba2731a7 SHA-1: 4e0a99ffd5ee3e7f1bb203e78425e49db02477b8 SHA-256: 30bf679b903e314c8a1e638e100ac65185198ff35898c49bf17fc245d50193ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised CMS uploads, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure itself is designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://2013.letnifestiwal.pl/ckfinder/userfiles/files/femufubitage.pdf In PDF document text
    • http://quaretti.it/userfiles/files/lediwabituw.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/85289464375.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/39483938011.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/48490144268.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lirutejejifikapi.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210928030405_gt4pw8.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e3749a03---21870691390.pdfIn PDF document text
    • http://edituj.cz/res/file/76075984168.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/rofuxevutolalopu.pdfIn PDF document text
    • http://deforma.it/userfiles/files/tajodujisudovifobi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f26d289225---wozovumure.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/11282814528.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/sivenok.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/pipufepurugiguzo.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/79330473301.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e22a809b3d---76193209820.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/73582222011.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/47r0cr915dehr8bg3vs5m40at9/bapodufivinepunawunu.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/zupoxosulodowameno.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/jelijunanesubesakog.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161540c943089c---zeriludexarit.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16160c01fe851b---49167868610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=shortcut+key+for+ortho+in+autocadPDF 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_off0000bc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 10740 bytes
SHA-256: e4a50e03611e23a53d81fafcbd59ba463a728ef2d0c1c81640783cce15cb675d
font_02_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 17248 bytes
SHA-256: b969b97ac95db40fdf7b54aeb1c6791ab2d081688c2f6f1bfa363fc0a8f3e2ca

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