Malicious PDF — malware analysis report

Static analysis result for SHA-256 5439abc79a34021a…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 15:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 530dd0124cf0e5ce31fdc6ec0d7e2354 SHA-1: 6a35398182db9c9724506d2b208da01c93effe31 SHA-256: 5439abc79a34021af3e5785cb36d4c81ec94c7fe50a2d6d040d4a662731abca2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin. These URLs are likely used to host phishing pages or distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware delivery campaign.

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 https://pistant.ru/uplcv?utm_term=free+download+books+in+pdf+format
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf8b27b80---8106695358.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160820f6daed12---muresux.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b24fd926072---pisajeferasivagenoji.pdf
    • http://oumkua.com/userfiles/file/75997350139.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1fe68faa9a8756fd7264021a07881750/bezezurupijiruvotirowe.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16086e75015bd8---doziteva.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rielqar5e51c404s6rotr1og83/94022871133.pdf
    • https://fablab808.com/nbloom/fckuploads/file/voduxorurapixika.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081b94b76151---97480182098.pdf
    • http://forter.vn/hinhanh/file/namajabizarefizafawosup.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ecd8be3d1ef0149e0eb221fb0e218d2a/38664368123.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9ba566e4e---18994168799.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91f2747cf5---jivapesekipupukogiruf.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/81064b9a173453d27a2abf77e0cb591d/kirojirukeg.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/43312376171.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tbbudf19tsid3ucs1sqj63u788/setemafazebezapegunete.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094da20da7cf---76852082801.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/cc4fce0ca085567dbaf45716bc82c3ed/14154572139.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/2e6101238070fcf5e6669c23ef93345f/43672074821.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607190297d1cb---bezuremap.pdf
    • https://hissekurban.com/resimler/files/88352237273.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4hrp4on8ui1bad4flu72d58gvr/20317420364.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/21edf16974bef3fc9a8373c77d2e179e/pulenikazedodopaduganomi.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/262049256314be2324f1defcb7b1071b/46611152923.pdf
    • 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_off0000eb8c.bin
145931df3bb20d2f835596afa7ea97ac47adbdc1333cf8768c60c5d11cb7bce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 17656 bytes
font_01_sfnt_off000119af.bin
c6c23881fac3f0ded8c4d9ca4623afb977043de8f108f5e1a2d4a9dc98c1f22d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 10952 bytes
font_02_sfnt_off000132dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 16792 bytes

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