Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e07e236bdd98085…

MALICIOUS

PDF

90.9 KB Created: 2021-09-14 08:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e92bae0aed476f215c0b96e70031d12 SHA-1: 49cb743c5c350c6311eb08163ec49b6ddab8237d SHA-256: 3e07e236bdd980854d2fcd9ae8d4319ecdc20ddd574488daf6750f5508154101
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms, suggesting it's used to redirect users to malicious sites. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=samsung+note+taking+apps PDF link annotation
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/64346009192.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613469208a87f---40134043720.pdfIn PDF document text
    • http://lamay.de/userfiles/file/72977276626.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/1908563910.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/piwirem.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4221a9a0---nasuzibesimededorutadi.pdfIn PDF document text
    • http://banquat.com/userfiles/files/18178039682.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/vitufefesosenil.pdfIn PDF document text
    • http://specialcats.nl/media/files/25699748666.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/geruvuvogokaliv.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/31422959261.pdfIn PDF document text
    • https://fivetc.net/uploads/files/34455031060.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316216aa6d3---suxipixet.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/xuniratusobimugofugevum.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161379950d65ce---mikezusose.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/guvuxafezikuwew.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210906021249_9mh82z.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210907_140337.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/kiterixo.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/zakegoluzitatemi.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/boputawisitob.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090120582329.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/pusojobojagawafizap.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jc16m31fvfuv1lecjs2apb3sl6/nuvupunosu.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_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 18048 bytes
SHA-256: a7ebf4aace4bf759fc3efacf1491f7195e36b643b5f9c1de9e8402f971b70a66
font_01_sfnt_off00012d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 10716 bytes
SHA-256: e1a694388a481204d12293dfe6e171597622d67e2fc2414565aa2ba662898918
font_02_sfnt_off00014611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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