Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8c4a307cde21de…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 11:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24b0064c3cdd91cb88b2d40abc1f5772 SHA-1: d84cabb895478c28f848bdd3794d6c1cef65c72c SHA-256: ff8c4a307cde21de3a8445368d63db602fcbf0362dd782fee69572b65647b269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan distribution attempt. The embedded URLs are designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=ada+gtu+syllabus+pdf PDF link annotation
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40a505e0eb---wevov.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1d68b49cb5a0c95ec8b8692eadbdd77f/58898304905.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/11376626580.pdfIn PDF document text
    • http://xycrusher.com/d/files/1779068821.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/wexawunenesiletilenej.pdfIn PDF document text
    • http://idcla.net/upload/files/sunimizatimuzubozewu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cd8ebf712---86382389436.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f0096c846f9---34127180894.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/49313337734.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/rawikogaviganijixofidu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/45f0f0b9cffa451ed1709ca5a7105371/70440460449.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919665c138c---33834720939.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/wipizaxenigufamopug.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/cf58c9a742a0575a7d8e2c68bbf6089e/tapawixodorexulibogebu.pdfIn PDF document text
    • http://vhshf.de/File/tugujewiferasexu.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/xodivodoranubazavog.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/gutukizubedobiw.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/limupufut.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b7ae84fdce1c7b6b30a236139f3a7e50/94740247309.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/fd298ca5262629800d487838616217f1/muderenimugukogireb.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/zibisuzab.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/pezonadiwot.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/bapavupawagisi.pdfIn PDF document text
    • https://ms02bet.net/contents/files/29437250188.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/614062183.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_off0000b94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94E 16016 bytes
SHA-256: a471a9e402c404624e7074a91ad24e8642f1c2ffa650c39e63a8f42899ad3b2f
font_01_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 10460 bytes
SHA-256: 187a2b2aa4caa0cb37b43d40ac378781a426c97bff60f29e4fe0c73b1fc5766f

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