Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d34834790522b9d…

MALICIOUS

PDF

75.2 KB Created: 2021-08-26 10:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52faffeeed6e3662184580685a6e3ffd SHA-1: bf08e78008022182f57bbcd0575cbc8e09f3e442 SHA-256: 1d34834790522b9dc2a1e583b7d1083b58a6972363e7d5971b6c2969ab571f15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are intended to manipulate search engine results or lead users to phishing sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://deforma.it/userfiles/files/41788027436.pdf In PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/goxabenujuzunawomoro.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/55043748425.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/15844387108.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee220cc3d---daxuresarafa.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/54636448659.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ieiadvv1hgp1rgighd65gs8eu5/wiwive.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/powara.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/53466699432.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/fenetixo.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/titigetimadu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb5c5d6f6---69018687357.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b20f5b77e---zepafe.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c3b8dd982dc11e214367618b623be140/20218779085.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3b96c29a4---32855829195.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/najibibe.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/27938452796.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210814_65E762BB05D999E9.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/fejaka.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a23ee9515380fda9f19badf5e71b6112/vuwabevajalajon.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/koxubitefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=is+0+even+number+or+odd+numberPDF 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_off0000c558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 16128 bytes
SHA-256: 1e3378df9c7b84284df379ffac707a99966cc3b5f21a3984d9a9519f17cba4e6
font_02_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 10392 bytes
SHA-256: ffedd08afe2fde2c3593cbfbe32cf686842243ee859d570c532b58b12056001d

Open this report in the interactive analyzer, or submit your own file for analysis.