Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c73623d1d8fce01…

MALICIOUS

PDF

96.4 KB Created: 2021-09-08 09:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cabdb830e8c14f9b4e37d12670f8d694 SHA-1: 42aa7308f6c3d4c3fe2de30eaa70907b666c887a SHA-256: 0c73623d1d8fce01c1e58d03bb97a370a347b555cb5e90262e37998f01b02849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://inwebjor.ru/uplcv?utm_term=helsinki+city+center+tourist+map+pdf PDF link annotation
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc67353312---patolasuf.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/dezapivoburakijadalefi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607177d5937be---rotuzefumogare.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/vobesasegutoxenul.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/munikojifeno.pdfIn PDF document text
    • http://teplospectr.ru/images/files/25422441221.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12816067533.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/gujaxinewiduminosago.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6908fe6450023efbe8d8ecb8f4f0017a/93076648049.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/61735584695.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/010824299274.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762d592d320---soxomitasu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/wudomaroluxurubimitidot.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/mepebemetuvi.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/dowupebemok.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/98013128631.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/54471428648.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/12312579475.pdfIn PDF document text
    • http://huimao.com/upload/mupexamorav.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/66487370831.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/33743000519.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d4c561e8c3baea25aeca048eb9b32c8b/kapevuganok.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/60005026934.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/25338476035.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baae4b25bc---91863754543.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/gedosipifowudowes.pdfIn PDF document text
    • 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_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 19036 bytes
SHA-256: 12887fea30a9abff49c12c98d68ddb29e6236f77e977aac35f08ca2b8952781e
font_01_sfnt_off00014210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14210 11080 bytes
SHA-256: 5726290896dd8a6272963c15482319ad76421971147a149458c5a2ecaa5aa681
font_02_sfnt_off00015bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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