Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa247383dabb54b…

MALICIOUS

PDF

85.7 KB Created: 2021-08-18 06:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 753c8b06ff34201e22e0f535178c46a9 SHA-1: c49b78250df43646a5a9a780a3d55e6637c07819 SHA-256: 4aa247383dabb54b189fdf1a054cae38e369aece3a8ba03e02e1f98bbf7617c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608852aa82286---suxozozil.pdf In PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/tavunuxaxafed.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210614060648_gcbgs7.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/logutonogaratigugimonavix.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97254636897.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/43096b3ec3d42bd38e422dad1dd2b02d/fixipetikamerapovusa.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/609fb8dc911346a87a956f4fb3e8953d/32360853150.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d1f4fcbe29b642b3acb3f2868f9520ec/88422394990.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/bolifulugawapef.pdfIn PDF document text
    • https://www.casestilistas.es//ckfinder/userfiles/files/lorepapu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9jhakj2cug4ejdaec8dm2n6oqo/kubinejepuximuselugafur.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac8913b228---69558411803.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a011b420b4a---nifigevemezud.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ccfab335---5423626223.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/68504165834.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/18394195356.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/afa20f146978fac870898d2436f71292/xebobusoloxa.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/2794570876.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/peselava.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/dugedobumatatezega.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/61961054705.pdfIn PDF document text
    • http://sireny.net/share/files/berawexuxotujutubopo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/frdmipn4q06fang1bpe9708qi1/rigagudapuduzokiruv.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc25964f9b---41205881619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=opposing+friction+physical+science+worksheetPDF 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_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 16112 bytes
SHA-256: e92d9f990a1d0fc0c67877e38062c4d8ea8eb6671cded14297f6d60d05b9e4f5
font_01_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 11076 bytes
SHA-256: 0a208c3009bc2dfcf6b6de1a4ba10a6a836b4d6a141096a5fa74f7977f47412e

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