Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6c4d345f2e92d6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 21:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d81cc783eaa4d29e5bf24f233ef55108 SHA-1: 14b5a0dabcfce00b78db365c5c4a12ce72c26357 SHA-256: cd6c4d345f2e92d600d459e41dab35edcd592c45996ebb1cf002f1cf2af260df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=labores+del+hogar+revista+pdf PDF link annotation
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6f4dd61562f6fa81c49fcac74cc9d690/vojutufideler.pdfIn PDF document text
    • https://master-service.ro/images/file/52949097174.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/21664974958.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc523a71d5b---nuvadederasabupazejuzi.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/rulako.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c5f0bc466cae2686f240a19431109860/pagoselasasomuvovepu.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/danapesetaxutujobiduj.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/32415066057.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/33c780505fc76e56c31b26e6f5a49de1/12800957629.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/foboxo.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/10266447338.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/84936531757.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/aa38f2268bb79c5b2f30b5a247b46515/10805696540.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609df3b406156---98763430737.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/dovike.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/zajipaxusoromikanize.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/25f6325c05c7b4100dbd504c84f5f4a4/26572576480.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/54732862965.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d384c6f7a3---laguxokeg.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a012de5285---posoxokipilefojikuma.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc56d618e1---porulowemo.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/keravurisemogu.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc8502236d---winupoxevilig.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/redadepegutifuv.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/koduvixasixuxedo.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_off0000d41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 10836 bytes
SHA-256: b004bc4565f4ac2199710aacb0b46453ed8d8ce7d26f0e61eb06145015ac9a58
font_02_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 19992 bytes
SHA-256: 1ac20ec1835b389772c09c61cf16fd66c9877ea930cffff4dca80b423e603bad

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