Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade428ef506c332e…

MALICIOUS

PDF

91.3 KB Created: 2021-09-02 09:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dfad1a31e9ea2cb509dbeaab69d3170 SHA-1: 00668ead978047b5884921534c5c8ecea94e5269 SHA-256: ade428ef506c332ea58c107cc0547c46beaf090f68fc63798ee241c503793cff
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phishing pages. The presence of numerous links on disposable or compromised hosting further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/94f5t1or8dc2t44lathujmp82c/devuso.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609da59e680a3---50046833093.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/xofogebesu.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/40413157728.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6835d429197667c70b82d72839f2f481/gavenusemijafeta.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6de805d5e---waxejaduromiteduwul.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6832644ff---gagadopadu.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/gelilomusuvutudade.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a93aeaeba---53148814490.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d47eb7d6---57051795034.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/29950537102.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/vozejalasenonox.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/95139317267.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/16747493150.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161295634864dc---55775980119.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b5c4017e6faabd9694d426c765a6876a/pedaxejiwiv.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/45658477420.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/9ivg6hnfat9l61l05cds8q8fc2/68654360069.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/zolelajose.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/66869302545.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/52090408680.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/63430505823.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/tososefariralaz.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb59d51ba0---46579214699.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a2cb78f5---jesomiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chariots+of+fire+sheet+music+free+pdfPDF 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_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 18948 bytes
SHA-256: 580d4ca00222cb8355f54684a783a5c99d2b62e1044b14d6ee153cc7a9473d66
font_02_sfnt_off00014444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14444 10864 bytes
SHA-256: 541f49cae21e50a016bc72fa4f71ec55aa69873ff71495a86e57ad49f592147d