Malicious PDF — malware analysis report

Static analysis result for SHA-256 e453142f233dea2a…

MALICIOUS

PDF

93.7 KB Created: 2021-07-01 13:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7e2677b7c0df0c6c71254f4360302b42 SHA-1: 3e72bd3541b087b340a9a58c167650158f93d50d SHA-256: e453142f233dea2a9b74f28f843f784555c9fa178862995eaf2b90a9e98ce4c9
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting. This suggests a link farm or SEO spamming campaign. The ML classifier also flagged the PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific intent beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://cybernet.asia/UserFiles/File/46225808911.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160885bb22dea8---tejipogipadavonem.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1e66fb560d0446018b5d14b77ec0ebd3/nagidapojojixovok.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcac621d4c---tunaseveza.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/2j10r71el9616n96bce7bmboi2/budil.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c53bb722e2c---denorijibisojugafo.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/4521247635.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/99cc6619e70e2b7aa1cce3aee9744779/jokolelezupinemovudus.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85e69d14e---nenutelojemi.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608560c1d8d88---tidobekorodifipud.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/de2f4c5e0335cdece1888b73b5b8f005/wusopeli.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bbac866606a0c845b15bfd8cb13cd0cf/39615524542.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/81166914373.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/ximotegibosi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29de9256b9---wubamovigegisowiredadun.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/petelefikatexu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cae7ebbcc---kaxifawubokojidomotu.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/96034198192.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/kaweb.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/wevelurijagojujenebomop.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/fevipoje.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/fifokagobupida.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/turefer.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160704a9186dea---loxunafupidijowezug.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/20466854942.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/gufedaremavetovepokami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chronic+nail+bed+infectionPDF link annotation
    • 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_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 18624 bytes
SHA-256: 785bb83c55917211d2331a4c2ba2429441cc81a6ec02f7eb0eb9efdaa16dbccb
font_01_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001501c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501C 10576 bytes
SHA-256: 17faffba1b0f472b080bc25900e85fdc4b8e471e8acd957bfcc12e333e95d739

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