Malicious PDF — malware analysis report

Static analysis result for SHA-256 448b5ea4ccb5942d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 06:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d067f5826678be57adfbdfbbb7210d3 SHA-1: f4d083192f4ade699eeb889ca43fd323960053ec SHA-256: 448b5ea4ccb5942d93cb46cc4b5e13161bd1d921a2c17b987f2c7e61c4280e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, directing users to various compromised WordPress upload directories and disposable hosting sites, likely to facilitate the download of further malicious payloads. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=aathichudi+with+meaning+in+tamil+pdf+free+download PDF link annotation
    • https://alice-immo.com/userfiles/file/fojurojufeneradagixujol.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/1f91896a29747af2f0dfb397f4e3b60b/rulukufifinepututejezer.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/46768022951.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/10626649193.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/57915618879.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/regevagexe.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/14i1il2534ch808d2e3itfvb4o/tusesapixibigitumuxu.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/nukutuxigivulojodaloleb.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/68916520843.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f0a59cf1---35510395109.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160aee0d5acc89---10465960462.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfae9eec0e---9343012394.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/51440832768.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/puregevo.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/vinepagixumisetexalexuga.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/22713468832.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210524023412.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/67202771578.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b592a9810bf79078d6a85366ae60c462/7816333660.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7eqkif1r7vljm8tmqgnjhv6qm0/92507871574.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/modapedoseberexojofolajew.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a2rpnogvudickn0bjq6gh4aff1/kaxixisowowugu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f882a08b---78645826666.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/vivetebijosolufov.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_off0000c2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E9 11068 bytes
SHA-256: 0b3a6d245e3905a434d160c9782ed182fc1d6e85efeb21beff32197161682bac
font_01_sfnt_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 17304 bytes
SHA-256: 363437e59181e3d936bc93f99fe39d08e8ccf7b1789127a242bc648bba6d0bac
font_02_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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