Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d2a8652ea4a723…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 08:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4127165f2186ba1b62011e7d6270440f SHA-1: 8524e4d5bf3e25e32ca06802600bb2ced93bbcc5 SHA-256: 79d2a8652ea4a7239f83984f176da79bd31dcdca357528c557a6dcc440308fc3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and link farms pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=new+appeal+court+judges PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b9cad9f9---nozen.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/660f3abad11195d1412dcb5e3ebb90f5/lodirekiwu.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/71832616449.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/b2ph694njvbmn8ballq1qgl87n/74770964867.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107260231063460.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/gabebo.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/xigodedeta.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae2e89937---sujapasalimetulofomo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3c7c209fa59d206cd28d47360fc13d93/nemez.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/83502195846.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/nunudebejotasamigadoneno.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/2444262456.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/jaxerexuk.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/sufepujakeravidiziluti.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/17501986883.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/vimukopotuk.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f57d4d2d6c7---14760822440.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c687c6a0f45---88435870952.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3p3cqd5tvq8vdtqt40nss7pakb/fagabimirudogu.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/13579263736.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/6022320199.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95c197a55---zojemagivifu.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/jibojodiwid.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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 18168 bytes
SHA-256: d772ee2f34f16b4d3a7f0a8d27ec447c8c748b00d092461cdb83d86b28b9ffe6
font_01_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 10784 bytes
SHA-256: 5e7187fe3f8e27f49aeadb5c3eea593f95413ee6c14d71716f8d2b7b2443fb36
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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