Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a575cb7fb63f026…

MALICIOUS

PDF

109.0 KB Created: 2021-07-02 05:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21363785ff7c8ca42c0136f8bd0c6df5 SHA-1: d1a1b1821c3a2de3de7d0caf89e9c591f3a7bd88 SHA-256: 1a575cb7fb63f026d3e58d132235d76e7b14ac59fc0d2b36d9e9d267fedd7080
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this, pointing to a technique of leveraging compromised infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a16157cd9---vajasidiva.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e974786f3632c5c18482072b7b92b651/lutusuket.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/dc45ac2298582f5d8eb4c7ad188d7ca2/jevaxali.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/g87qv6gff27nnrvnnbjkmh5ivu/wulurufo.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8ecae21af91f750bf1070f375e62ef38/85804310669.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6da0ad49---27002489675.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/zipibixusamij.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc50be810---11628865724.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464c319083---bivedomirunojegu.pdf
    • http://matstravel.ru/userfiles/file/sapazuzesitazus.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52a54285da---97543651491.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/71755399228.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/856d12be9e3f9678969eec2b73f83a5a/46023381244.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b97fa7985d5---55106192269.pdf
    • http://misspacificus.com/clients/873634/File/59924449679.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7083124e97---torolumulasefuga.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/agdeghae5vvinni9q1tcup0tic/fibogoxekaruga.pdf
    • http://vhs1970.com/clients/873287/File/50859286440.pdf
    • http://afghansolar.com/userfiles/file/zivogokomimutaxomaju.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeef9aa498---65501189356.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160993c151a5db---zevotuzos.pdf
    • https://uppersanduskyrotary.com/cms/files/File/gekegexob.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071aebe4c047---88510573296.pdf
    • http://sztarmedia.hu/_user/file/16194748585.pdf
    • http://resheto.ru/users_images//fck/file/berakotomumofekarox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=foucault%27s+history+of+sexuality
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001494f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1494F 16792 bytes
font_01_sfnt_off00016161.bin
2d8320c98b3b842365204a3d075d400f8b73dd6e6d695bfcc8c39468342beb90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16161 17340 bytes
font_02_sfnt_off00018e2b.bin
727cf5c9c076a381d170e77ce37074af2712a68af6b04c9eaa79668a7a017d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E2B 10656 bytes

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