Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc28ed4b723d0a43…

MALICIOUS

PDF

119.3 KB Created: 2021-09-01 14:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2e50c2606c5cc092f066b070ad4f4d3 SHA-1: 015b1fc52f04d891df197bbfd43fdc63623e45c0 SHA-256: cc28ed4b723d0a4354a105babea920796c17b60411065f38ebb28d5d1a49b0fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress upload sites and disposable hosting domains. The presence of external URIs and the overall structure suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://ketchas.ru/uplcv?utm_term=application+of+secondary+metabolites PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad979d9f19f---99200872041.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b887f031c7a---44970900996.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/fevijamemuxobuj.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/87973032383.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284ad4990d---wumoxadogagubofedug.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/nefugudusuguda.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d34297a53c3---91032148521.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d3161a282---97268154358.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b60b7382e86---43038438347.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609153e1148c3---jemilotozadaxisabo.pdfIn PDF document text
    • http://3sdent.com/upload/files/98343582836.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/xumubexina.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sebakumoredubabolezer.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/87cf737fcf1ee5633d122260b8bd4974/53503747275.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/16753794054.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7dd26c0b2---1079267480.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/lubofam.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161254bc9e8aa3---xawijivonosezotikiwudese.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/93333827620.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/921276a49c71660ad1522dd2e4780de6/925816933.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/falazavadaxid.pdfIn PDF document text
    • https://thepainter.asia/upload/files/jejowakafijalaxofi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c999d3305---90321863482.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/15447191486.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_off00016822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18034 20772 bytes
SHA-256: 281e5c26d8e24aa1e9d5b40e82a4cd3bd8249210b28686f48e0d12d5bd744c29
font_02_sfnt_off0001b5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5BF 11016 bytes
SHA-256: 1856384472991fa3cca0f94b1ba03fe9a50773f3c45e66b3323ed0237e929a7c

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