Malicious PDF — malware analysis report

Static analysis result for SHA-256 470427a532df1c88…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 20:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23ae4396f8a10685691b143e6a8aadfe SHA-1: ce9ee01ccc2896a77395730fbaa69668104da2ab SHA-256: 470427a532df1c8813eeb06042c5cf3e70739c06e8d2431bba8f5675984dc7d0
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a visual download button and numerous external links, some hosted on compromised CMS uploads and disposable domains, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzeyilac.com/resimler/files/13699359456.pdf In PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/tikuzurenekapuzu.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/bovovu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/52722293431.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/78028745489.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/wudavoxakogapa.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/kagagomagofuv.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/fumanajok.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f015785fe4---24562058217.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xexikenatazilexofaxaje.pdfIn PDF document text
    • https://baptistfriends.org/media/84580068467.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/95301389255.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/14583574961.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/selivebupilineduvuragabuz.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/98940377362.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/79930629474.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/fetopokifavoz.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/kopejiwid.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/wobawewuponosesokesi.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/5d5182db0f4312e77069e3c8632d9e00/82651101736.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/tevoruboruvaxupal.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/37156420137.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/sibekif.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ha31s8ehvuppeka53ffi79li4a/piwejen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+ome+tv+apkPDF 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_off0000c534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 10436 bytes
SHA-256: fab241e6df4a9248c613895c429ccf7bca7937c82f40522a2be3ff00bb41e506
font_02_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 17000 bytes
SHA-256: 28360eb0a86f4417b5dc1d310de9279b3c52abadc4a344bdd2dd5898d56382e6

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