Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac63b7a13de78540…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 15:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2089a5021382f3a04409f1efd9615e8 SHA-1: 4edf88804e43b59dd8fd5e6541bb1a541900d3c1 SHA-256: ac63b7a13de78540f14c002dd6a4bf8d619c70363373bf8a638a87972dfc5500
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://phutungotodungha.com/img/files/lefatok.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085d50783e1f---makekededizinofokusidup.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/budoterijiloluvuruni.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/40452605826.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16073673912fcf---tazuw.pdfIn PDF document text
    • http://brenderup.ro/mm/file/52588332015.pdfIn PDF document text
    • https://termofriz.rs//files/mivojovisele.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/36913706301.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/surodefunuwunareviso.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/99710775340.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/72108648827.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/maxofenewowijabas.pdfIn PDF document text
    • https://aneri12.cz/res/file/39378327681.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/xunufuwakomuta.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/79899194632.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/212pe1vqgf85v92slh30oufb69/59809802550.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/69924367478.pdfIn PDF document text
    • http://127.0.0.1/kardelenemlak/upload/files/69771290141.pdfPDF link annotation
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611a976134a33---mafebixupobewegosiri.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea2c8086e---zojegudodovotamiz.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46807a035---98386338157.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/d4hqe1dofj0fgubnoimrq1lvt3/tozutegex.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612197dd5e7c1---vesokajumibidipajin.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/45899320829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manfrotto+190xprob+instruction+manualPDF 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_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 11184 bytes
SHA-256: c6b6aa58201d72313d72f9b3d3ccc37699579c12578a285e3d0e0dacd81ecb71
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 18740 bytes
SHA-256: cda4e2bf0aac6a0b5b6afaa000c096324344cec64671256a0a08299f38999793
font_02_sfnt_off00011d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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