Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f009e39a143e872…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 23:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a8ae49efd188cb62c27403822f9b613 SHA-1: 8f03685e4dcd65d70bf40f836e9819566d11b469 SHA-256: 9f009e39a143e8728c11583cb7c21b6334180e23e112b653536b18233073b06d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external links, many hosted on compromised or disposable domains, suggesting it functions as a downloader or redirector for further malicious activity. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=pptx+to+pdf+converter+free PDF link annotation
    • https://kitapkaplama.com/upload/ckfinder/files/xosasemevexomajowe.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16144568860111---luwudibixi.pdfIn PDF document text
    • https://ratodua.com/contents/files/21750414522.pdfIn PDF document text
    • http://mextro.de/upload/files/59087923770.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/nifaxuroronefe.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/81481936037.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/30912260992.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/wuwiwumen.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/dofarumo.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/titefobagaguda.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/75461661159.pdfIn PDF document text
    • https://ksboutlet.com/file/files/85688634256.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/pewulazebibukarituxovaxeg.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/61668481337.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091905043073499.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/feniwopoxizeseru.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142aac4e9d66---darilixugekabanagu.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/jopisinogesijibak.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/07945eeb77e653ae0d6ca2af63ba393a/xabet.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/cd3032d45a974476bb7caae1596ffca6/wudopudu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161395c54a2353---23528035303.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/tadufusawa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8fc643e4---dolijukusikuguzipe.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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 17628 bytes
SHA-256: 5ce3958c262b2da2c7feff2c6a85b3e20977785a192a39b23c58da5bf3115ac9
font_01_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D6 10316 bytes
SHA-256: 680d52ccb068202276d6dd2865fb9c68525194856c76f3c32915320dfd4b73ce

Open this report in the interactive analyzer, or submit your own file for analysis.