Malicious PDF — malware analysis report

Static analysis result for SHA-256 e319df03d80f12a9…

MALICIOUS

PDF

84.4 KB Created: 2021-08-11 02:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: d11cc540453649e2f40c3f374115b725 SHA-1: 7e6d0c9fbe27de2d4c91ea41f6a9ac4d0d49e85e SHA-256: e319df03d80f12a94a77bf40aac6de263e5d00e0885d9f6575c0c37678a348da
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves redirecting users through these links, likely to a secondary malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/f2nbnatpo5rm43tcfsci3ejacp/20261158653.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/453d99aa8fefe346ec89557f73d36a16/kunowakixozobo.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/tibolivakiweja.pdfIn PDF document text
    • http://accesoriosalmayor.com/images/userfiles/file/76198977641.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/soxifirijonenumipax.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070641bebf39---90521923435.pdfIn PDF document text
    • https://noddy.nu/images/file/17534831997.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/25eacd908c2ea4771a469092b7f32599/vukewunejatalopu.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/70825740715.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0d90510283cfe8999e082aaef67780f1/boluvawekigodo.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f359506b2868b4fa114d5114e0831308/41330654073.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0fc646593a3530339c12484fbea83536/62884655722.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/vipor.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/vapesirafubigitabu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610e434b0a50d---33818365657.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/83001845076.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7dpa80ttbpv18go4j1qkkcg04v/remavozazejedaturepe.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695c8795c1---lavejemumubezexin.pdfIn PDF document text
    • http://contelex.it/userfiles/files/pupetaxonesoxasomek.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/82927182754.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/dpn61d2ge44hiaoourmncqe0re/taxevumiludiluto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=como+quitar+herramienta+perspectiva+illustratorPDF 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_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 10980 bytes
SHA-256: bd40cd69ae9ef200e37be013844ad700cf193b70100786c9495c5207067e8f10
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 17928 bytes
SHA-256: 63970ee79f7be6ac6c7a3ab80e992dee39f1283387ee96a4fc635798c4718d2f
font_02_sfnt_off00012921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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