Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f432eae9713ef6…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 06:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53bc17f38212b89cde2cae25771bfb1f SHA-1: ca418bd7d974555ec039f9e770834aaf97cfaf6a SHA-256: 31f432eae9713ef6072e3379ae65e4b1a65d036b6f8b8ddfc3fce949e3f2d78a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of external URIs and link farms points to a lure for users to visit potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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=business+plan+for+import+and+export+business+pdf PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/0ts2fp6q8e33dg9mstqd17q7r2/toruwavezuwikar.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2027fa5d11---14241657173.pdfIn PDF document text
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/68254706055.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607339c4c02c2---62732346363.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062216053030.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/vedowuvarewob.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1629092032.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4ff7c7033dbd752286fca12d45b5aea9/jasedazol.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/53883979874.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/67342587053.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5c77e480dde5acef4ef8a006a9802b25/52897600254.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/17540836706.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lakig.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1d797c8bb---wugoji.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/239b0fe2f842b964cad8d27324791502/mupajifalagala.pdfIn PDF document text
    • https://digireg.es/upload/27227012200.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/35143947203.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/nolusasatit.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/vovefomesoj.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/j10uphq4ab7vhun2bjdltena98/10438870339.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/82176304367.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/15681806198.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/puliruwigixum.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/btujfjficrni8hsr7plgbl662l/23795893835.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_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 19388 bytes
SHA-256: 3bd5e798ce113d7706b16cab835aded7d4bcb14e6c14144bd04ff2b2d88501da
font_02_sfnt_off00012d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 11052 bytes
SHA-256: 32631f016f2a66f3c2d5c21009c1feeec763c36029cfd1387e6b73546c8ce78e

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