Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b73303a6d4c4ff3…

MALICIOUS

PDF

91.1 KB Created: 2021-09-04 10:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce6e98931cf5f885cd2d02d71b3be94e SHA-1: faa4e652ea0b9d34b98ae1bc8a0182bc2f6dbd70 SHA-256: 8b73303a6d4c4ff3429ae1c605f9a180a7901ebc308a3f2b22b96672ffbe9f4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to direct users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/5ucr77sdjb9oaa2a6ggtn7ur1l/sesavege.pdf In PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/1551923036.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/lelubodetejuzirud.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/34240778562.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/duvuvomalobuwidazute.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/valerajad.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021070323595548.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/vamigagelukiduxexis.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/44522413135.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9564773622bf64ce972350059b4df917/malemojulerafasagifor.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/samizuluponasisalakaxitu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ecbc09d884e---22044119924.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a10cf456---7307934989.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7b65d55982ed801f6f6a4bc81a58f686/boxotibuparerije.pdfIn PDF document text
    • https://ikansambel.com/contents//files/39443323505.pdfIn PDF document text
    • http://gptools.net/userfiles/file/zidebugepeworotonepo.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/95536202485.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b794f665---rufanilalup.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/27299131368.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/31910564785.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/46911750808.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/jowajajiju.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/demebojiremutemupofezuxa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38a7100c9---gowirarirapululeveref.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/32011252590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=manual+sige+mineducPDF 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_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 10488 bytes
SHA-256: 61cb3fc93d65c5a1cf0a0c1c782760af840c2447a760c6b057a2ff497a2cc38d
font_01_sfnt_off00011609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11609 18560 bytes
SHA-256: d80da20a979d3f3577c41da36298939ea326abd2ca23b802d77127a74c0e00da
font_02_sfnt_off000146b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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