Malicious PDF — malware analysis report

Static analysis result for SHA-256 458bf7f28a04c269…

MALICIOUS

PDF

95.8 KB Created: 2021-06-26 01:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03e1028b8ec15d42da598cb364053513 SHA-1: 15c7928d2e42892b8af53ff475ce698f7e002b4b SHA-256: 458bf7f28a04c2694a7d57ca1c13dbb31687f145badaa1d8874156bda22fac40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing pages or download further malware, aligning with the 'Malicious Link' and 'Spearphishing Attachment' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ehs1958.org/clients/73155/File/7608264836.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2rarb37vfspd0ufkieqmgumh1n/zevuk.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859b04a5ee6---32915795395.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/krvti7i2v5mn5f2ad8qsetqt2t/tesud.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e6d4db08b---18047014758.pdf
    • http://irths.com/upload_files/files/34217897237.pdf
    • http://inwallendorf.de/userfiles/file/dosejadexefizezigokodajol.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc18cd149---fuxoribuwi.pdf
    • http://dagmar-e.de/userfiles/file/74669843713.pdf
    • http://turhantur.com/turhantur/files/zasosibulurovu.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/cc4c29030680cec4e43e0b4b254ef15e/12626611656.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd2e9b2aa---45948359170.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/0f900bfedf8e7bf26f020da01152a03f/10877323371.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b6655172dce14777452c95dc0c52928c/48524900763.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a455256d156---34706612424.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/k3dg21crb56rob385u2dofu3u2/76774372681.pdf
    • http://amphorabeautyclub.com/campannas/file/3181852804.pdf
    • http://php-lounge.de/userfiles/file/21007219578.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/nfucktgg0s2u5og1fh5fil4nt8/dorux.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/masiromowarej.pdf
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/389rsoiu7fj4gsm4gnf8i36moe/61771635250.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/37315477327.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/13806681ca85f73b48962247fd0d1837/42211321566.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=much+awaited+meaning
    • 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_off000115fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115FB 16792 bytes
font_01_sfnt_off00012e0d.bin
98fab35e3bddb4c9e04b4817fd608f44c32d3947c78012c8b0481dfe59e667aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 16588 bytes
font_02_sfnt_off000158de.bin
a29777afca5f683bd961dc8c60dc642c56c6c838e9c2b65720cf3cc2ead970d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x158DE 10560 bytes