Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d82ebf65ab30d1…

MALICIOUS

PDF

621.0 KB Created: 2021-06-19 00:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1671ea974d601ae6f22c0eca24657ca2 SHA-1: 3844de7b1882b74e26032040b91289bf62805f17 SHA-256: 90d82ebf65ab30d1234dd7f8d442806784bee1e46043f5f7bc47ec9ca5d07758
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6776

Heuristics 5

  • 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.
  • 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.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160959d79492da---soxojebelu.pdf In PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/ff5232d2798e8008bb443536f45e8134/joxarenonunuw.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9637b7bf0---taxobinofewuximuk.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/96848926506.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2fe7c4a64---jexitulajamodogatod.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/79e6a4ecb57d4a24a8e74d5eb3282a7c/92752525683.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0bee80e98---bekikowuvoda.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/91943904023.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/814159ed8f17def9132482e9c3f8748d/20239847828.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/gimadila.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13ac19064---24351562122.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e37086a2d53d35ab1c0cbb25a841fcf3/vutatoxemapi.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/rkictqfqg53cuf0vlrvirqenco/98838060939.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v8cgbb6op2uoruh0a78qm6v1gi/23462076847.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wanoxidigotebanu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=witcher+3+following+the+thread+hammondPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000923f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x923F5 3376 bytes
SHA-256: 3d5f326e826fd2214c76f483a6705f7d5b67034a8a60940e37a02c7b64a9863d
font_01_sfnt_off00093023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93023 5312 bytes
SHA-256: e782901d920b51520ff31b90c29524c47b49930963f4bb0abd4a69a8282e190e
font_02_sfnt_off00094211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94211 2488 bytes
SHA-256: e6c9bfdd0612b8ac4530c2ae1db47e522c64d9546a778db47254f0711c3270af
font_03_sfnt_off00094cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94CDB 17468 bytes
SHA-256: 2fec104ed181faa6f3a4c8e488e041af04ae99805af59ba13661a00287956e3f
font_04_sfnt_off00097f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F43 16124 bytes
SHA-256: 41d2e213e1a8e6634d2331778003f288d63e84852d1212ef0c6c8aa5ac40c01f
font_05_sfnt_off0009943d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9943D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333