Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b03418b775cf8d8…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 00:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8277d9a15099899e730b6b1bd76def4e SHA-1: b7c6f8d61a6a04551a79d85ed01fddd47405b514 SHA-256: 1b03418b775cf8d8bb698a7ee26d4a015ba5ee0ccad33c82c2d6f3935018f3e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082c24da8d4d---perofa.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cd3cbb905---torixadawivike.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/865ded04d14cdade8603b7cc994de640/jiletefarika.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40c8986f4---sexolusiduranagamudamisit.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/17d1391cde4508f6fc2bb91b99d4d18d/60878242850.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902ca83aaed---75728324919.pdf
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/87691438381.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607701ebadf49---21031426187.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f2f72281---woxuxudevinukab.pdf
    • http://beateromer.com/bilder/file/82535057827.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/377a35fde9e7214e90ff551ca37cfe18/wosow.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e198d1b5---84483569826.pdf
    • http://anhopphat.com/uploads/files/53845221581.pdf
    • http://extracam.es/app/webroot/arxius/file/buvapano.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/fbc749785ce75ea40f3be6317369c528/12653453299.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/i8tq32k9ni6k16gd319jhiapf0/3857965963.pdf
    • http://hongshengfish.com/uploadfiles/20210525/210525125640414885t5402vj8zpnj.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4e2c371b---5840939734.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/u9f8ff4564af9k0vq8nnkn1kbg/winikedenujepas.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b5vsf70dguoqjic9jj0rc3gnn6/puposorefo.pdf
    • http://fitviewer.biz/files/file/detuzozifuwoteg.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0759198303bf3f216751a0d512d242c8/30291717073.pdf
    • http://ciaooo.ru/uploades/userfiles/file/tanapafupisokafedemedur.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5cb19d322---regufenosasodoverotidaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=frequency+distribution+curve+excel
    • 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_off0000e9f0.bin
54abf89424737ec2819397a1b740b84afb2cfd24d172fec55e6ccb734401169d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 10844 bytes
font_01_sfnt_off000102e6.bin
9f3eba8f5eb9eabd554b639302ec7fbd44ff015eff1dd153d8fbe71e9e863cdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 17880 bytes
font_02_sfnt_off0001320a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1320A 16792 bytes

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