Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b27738c1d498cd…

MALICIOUS

PDF

113.2 KB Created: 2021-09-07 20:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efd03bc98d50d4a59bc08260c2d90188 SHA-1: bf5c612bd636e7d28250805bfdcbef33fc7aa751 SHA-256: 09b27738c1d498cd9ec862a573f0217bc2a9357e90497da5e9a20eefdee3e3f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a phishing or malware download site. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=lycoming+o-360+a1a+overhaul+manual PDF link annotation
    • http://africareview.in/userfiles/file/72790761063.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b8edd92195a7695c20aa862130439114/pewudavoginetipafa.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55a27868a---43973118553.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/78407128433.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/jovotajisunifof.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/37016221954.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/81089817151.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/bexafudiwivopane.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/fegowolovuzafizas.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/begun.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210824_144220.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5e2d660e---vixuw.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/bevapeliditaf.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160764aabcc1e6---saritivosujevofupoxovad.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/bizoxip.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemuw.pdfIn PDF document text
    • http://badgerhillfarm.uk/dumovakogipevog.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/rufolalire.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/vororuxor.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/lobijili.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a29a0deacae---19988723083.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/96384545799.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_off000151d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D6 19076 bytes
SHA-256: f0383332c76e98d74c6d6079a0299c849b4bdf81d1cacf607810b6ba4da50405
font_01_sfnt_off0001835f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1835F 11196 bytes
SHA-256: 4b4d30539d6e1b0de19da6cdd19b0254166e4b1a69152a5c7aa361d6f6ef1527
font_02_sfnt_off00019d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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