Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e7e0be281c20be…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 12:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2cf22f03c29ccc928587e085126daa5 SHA-1: 51889ff1dea0874c83c5b6bc2faaa75ddf5772df SHA-256: 33e7e0be281c20bec8b1cbf703d67592d99a3b81386e6bda91c0f6f56b1bd761
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://lncxjzxxw.com/upload_fck/file/2021-7-13/20210713031429567042.pdf In PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f3f4088a2fdd62ad5ee32d6a1e02b0cc/96028045443.pdfIn PDF document text
    • http://ned.ru/uploads/files/kunadevigozoxedow.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/4347294973.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/08bfc0uqtggfbucfqbmvqddn3n/27037578632.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/18520292436.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e552da98---nobowazavik.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/piporikebanojabonal.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/4182591091.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/89303599352.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aa4ae1f6a---21146771646.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/54180751560.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/43441151319.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f2f81a6fdd89bc5d521726e28274c0a4/jidawobujaleseko.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/99087786758.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/99544698939.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/manekewowapiguxepomomub.pdfIn PDF document text
    • http://flexicourse.cz/res/file/31045263383.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160717e422ff4d---lelogavezipoji.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/80644187712.pdfIn PDF document text
    • http://retailcop.ca/files/26552664174.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/61338739468.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875c01ae614---41916784130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hmrc+residence+nil+rate+band+iht+manualPDF 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_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 17196 bytes
SHA-256: e0e45b33d59fc3f0f232940e85a79cd463691d129aaec1a7954e65ecdc8f919e
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 10744 bytes
SHA-256: cf59394eed309bd588d9460a1f4c272c3448dd68f0012d4602f211cba75e423d
font_02_sfnt_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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