Malicious PDF — malware analysis report

Static analysis result for SHA-256 393dba2b83fd6115…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 11:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54e9b8f140ba80553b93e6f2f3622262 SHA-1: 9399e7eae08e991f0d66d42750d2ed970ec0961f SHA-256: 393dba2b83fd6115f627569e83696de5ecc5d18c42481cb4ddde77b16cb73ec0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised websites, indicating an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/nl5isr69dd0t9hj7tdtuuca1vs/sijen.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/23ab02nlk9nfqje96hoosv8ber/6275200649.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/29476637896.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/63965344259.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/xijajamuligatexapebusofa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161338ed9458f2---kinananejepasuxurowijata.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219495418.pdfIn PDF document text
    • http://klpa.net/userData/board/file/38079096338.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210913192459.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/tefabude.pdfIn PDF document text
    • http://vtaky.sk/media/file/ludazovunigu.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/93057725324.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/80812486815.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/mepidavexetibewokurax.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/57850573977.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/70087873757.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161410fbc593ac---36283947388.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/33660130009.pdfIn PDF document text
    • http://only-svet.ru/upload/files/90930653471.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93502831391.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a31baa8cf8bbbe1cf0674ddbf5d31835/96511141818.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/33441767189.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210909030341.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/88370331568.pdfIn PDF document text
    • http://freeorden.com/media/file/jekenudanipi.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/zilabodif.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/21941287896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+move+apps+from+old+android+to+new+androidPDF 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_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 18628 bytes
SHA-256: 3702eefae69f45d16285b93389b19197a0e2289cc3b163d48a07e38f12f0f196
font_01_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 10804 bytes
SHA-256: 94709cc5ebd24e725840b3202b68c33168c3e00fa66b0e9e5ff058b76e780f31
font_02_sfnt_off0001314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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