Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53c64804ceb5d8f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 21:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1491638f5efc279cb2b3f4743ef46556 SHA-1: a51b50e09a7aa1a33f26c97faee5c030fc086f6c SHA-256: d53c64804ceb5d8f222b668f104153d9f5a19b3f71773a4d6ec864bdd4237c72
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the final destination. Heuristics indicate these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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=fasting+and+prayer+the+atomic+power+with+god+pdf PDF link annotation
    • https://adamslakeband.org/userfiles/file/54736344208.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/gedojaxom.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/jatax.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/51996254221.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/jametogabukatejipafe.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/lanujixolalanogafaga.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/fuvobig.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/mabegibepevujuxudajis.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/33699987952.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/xoluwujewozopopiza.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/remagojexekafarozogo.pdfIn PDF document text
    • https://theipbuzz.com/images/file/13211726123.pdfIn PDF document text
    • https://hoavily.com/uploads/files/nilovajawufovaneta.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/14871041294.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363b0ae404d---gituduvogusebo.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/joloxuk.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/21664143917.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/zupapupilopivipagelilawu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137453036d01---51890384190.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/58209150339.pdfIn PDF document text
    • http://ubest.ru/images/file/wakotexifajitoro.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/fogunu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c0a56ec6b5a43f9715b50240e8efb8f/4003624681.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161336cdaddec1---fovosiregilofofixep.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/8cbaf5bc682d939c8e0efccaf70d2ca9/bokofe.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/dunenuda.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/74924835434.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_off0000cb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 17008 bytes
SHA-256: 0056e8b43517c9128ec8544a78be9f9fa5d22cd4d22d7fa466515260568f5ef0
font_01_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 11200 bytes
SHA-256: 5c91e8dc6140760f0444a14aad166c13f64a20ca1faa151a4c10d16fb7608167

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