Malicious PDF — malware analysis report

Static analysis result for SHA-256 552cfd06968b3319…

MALICIOUS

PDF

92.1 KB Created: 2021-08-16 15:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a1b086bc11b5371d66bcf2bde865469 SHA-1: 5ce51857b2430519ebe7d67200527df6558c33f1 SHA-256: 552cfd06968b331950c9a85cdce45920615da8e898b026a00cbb2465da941ea8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The presence of multiple unknown URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/n6ed09g4o9jke37e43a32pqhh7/likegixer.pdf In PDF document text
    • http://matchedtubes.de/userfiles/file/42949750290.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/s9ffd15va7gg4hlbl19573nlk4/zopuv.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d4a82d5bd5c9804a1640d301adf8bf00/90374415139.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/52775361471.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/81685960197.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072014da1365---lopojomasiwesakevoriban.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/91659150549.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c11fb1eaa---boditiwab.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/tiked.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/19c6c6f9e859ff1cafa7358c41b478fa/41320179749.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2486eded6---bifuvejojikijazamatoju.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b899cf4bf49---55762134634.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/giwomivavamanefubokokot.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/499aaa16309c8d3782f437c9a2adca96/58021597552.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc00625d1---wegaroza.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/dusetukevo.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/lanoxudorufafakoda.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/824100d01b58794c40b19f687f1587a5/41448897236.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/n7j6m13v4a259vvi4m97563gef/72751485829.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5a3754d8---6571105108.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/83d7f7a92ca4ce692cf949a85719bd41/86170822086.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/6843092789.pdfIn PDF document text
    • http://yuli-china.ru/d/files/kowipomowafijafuzerox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+transcribe+in+gotranscriptPDF 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_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 17060 bytes
SHA-256: acc7f8e0906378ab9a5a6487756e79ad421b7f0f456d9a2039cca92b278126c8
font_02_sfnt_off00014a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1D 10720 bytes
SHA-256: f91501dadcfcf45f9dec691675dbea3c79c8c751c4630ad2e3fcbc916e8f794b

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