Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d49dd23cb538d7…

MALICIOUS

PDF

102.8 KB Created: 2021-07-19 11:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc0fa8aad178119776f9f983d2135ac8 SHA-1: 377a4b5b437082966b355a8e3574620bbf00fe20 SHA-256: e0d49dd23cb538d7c740b1eb0b0fb6433e5e6492519466985dcf5f14e07942b1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The primary purpose seems to be redirecting users to these external resources, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/6phpp8qhd03br2u062jddhs84s/pazafo.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cbfc3c265---tofotemomisaroju.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160885326497c1---82562863139.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae5a31a22---84484607452.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3858b1b94---letofuvozepopidotemaselu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6514e08298df888209d44504d23f7cbf/85482180906.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/11141797352.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/pikamoz.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/16287230111.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/defupovomow.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/hogjfdk62fpj7l4clrfvp17i42/golotaz.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/7889496567.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/7300251057.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/44367306989.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/52483450109.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/27550183684.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d632e427de---30185629188.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089714160565---49442984441.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2e4a85300022a69cee2a244916cc8fc6/zowedul.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hl19u3sfvtv8kseo55a4q150oe/nisimesezopav.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e21d03a325---46218048852.pdfIn PDF document text
    • http://519pf.com/userfiles/files/56536224444.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da82a638b---34901349631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hard+calculus+word+problemsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 10700 bytes
SHA-256: 5cc79525e2693019e99dc8275cd928637013ff12e6e4f8c2b8182d3a7d86eea8
font_01_sfnt_off00012e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E34 16232 bytes
SHA-256: af293b2b60dc5e826b00d8953dd18f37a59bdd939ad7d7593537948814e7f124
font_02_sfnt_off000143f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F1 18376 bytes
SHA-256: bc643d4a0c7845e2c8b5fbf551065996e66ebf58e75461e6c9cbc11645a6be0d
font_03_sfnt_off00017548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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