Malicious PDF — malware analysis report

Static analysis result for SHA-256 a378c30619cab572…

MALICIOUS

PDF

91.8 KB Created: 2021-06-27 02:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5895bf44994205d0244795c066f5549b SHA-1: d7c8d430d66ce582c4f294b03519af60c3c1cf87 SHA-256: a378c30619cab5726516e5d6e3bf79f5e31d19d2b9d2b78f7acfb7b06f62a0ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/ta29rnj6j9ouavci1h3ou2vkjl/lizawejidudefunitigujodim.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8b03f663---5988556017.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/xidin.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/19q77slu6m7nvrup8madki5n4m/88994422492.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052015540683.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717021b4fba---zabovebawuliju.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98758dbac---6986854459.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/373b0468ec41fee9cd15577748cb6f5e/84745399231.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/12671956668.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4979d529c---93565582462.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607836c241397---fatakita.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/j0l0dd5j50gf7ra6fscms62h3u/17159088973.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/meguzofuliwuxiro.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e9s1ns8musjd8ma08571kmjmfp/dibagafapolezige.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098836724470---74287142635.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a440cc6bfec3b24af022ced987e96662/31796451949.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/gilewofevolavasudikepum.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/nutozamorutewu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/aankvhd2js3l14ms741simqm3v/28622888307.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807efa49f20---40943650258.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/843aqvljflu324p7r7qtrn3usd/lujedabun.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608146678d461---rovadefasamaxeberofoj.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd428b848d1---27167247494.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/10s80eelounc45m8rs4mll3er3/3554842498.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73443bc5c7---40472623325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=approved+code+of+practice+for+manual+handlingPDF 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_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 16688 bytes
SHA-256: 5b9119a53be4d431ac19b398861e33809de65854cdbb0f2da6fd7d06640dc8e9
font_01_sfnt_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 11048 bytes
SHA-256: eec4a3c1d2ca2b0fbc31fabbdeb438d527af94859ff870ab7800a1614ff37cd5
font_02_sfnt_off00014983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1