Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e2128e2aeda10d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 22:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 63141c91ee5cbbaed119e883e9d587d2 SHA-1: f2388e665d35e3ac01367f79fd78a98fe51fe5e4 SHA-256: c0e2128e2aeda10d0f960459bb9b9db32db239749fa5980be4e5e0f5a2f77148
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://allytemp.ru/uplcv?utm_term=oral+communication+techniques+pdf PDF link annotation
    • http://atlonnuri.org/UpLoadImage/editer/files/bozopefefuba.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f8969e564---88688994881.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/cf9410384a47112f7c066ed80aa4d827/fozilogegozi.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2dbede4f9---48112572309.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/88523648772.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1mibnvap7eh12fiand8hrnpor4/jomopatamujitotet.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210901_493F295A712B8353.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160975115cae28---kemebipofaxatinu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fe43b0c1c---79598511355.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210830/file/16303303593599.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/rikumumozajokilexibidolof.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/37117309723.pdfIn PDF document text
    • https://zd-zeta.com/uploads//files/202108081827045448.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855d594de05---gesez.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d7064297---babalikowufiwekuxavifizu.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4c3f4ba566030ebba8fad19f4387c16e/93018911305.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/76175733961.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/vemalevipexukapasopoz.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/zikatupij.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c8934f806e719d31ba9e41dbaaa928a0/64030276291.pdfIn PDF document text
    • https://dafelia.com/files/44213253153.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_off0000cad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 11156 bytes
SHA-256: 9d9d61eea22db85877f45273668ffc7d8eb5000ae2b08b6ac3886f52aedccca9
font_01_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 17108 bytes
SHA-256: c7150e1675586b26f6b115a43f2ca4b21f1f0260b3185dbb6d993e6ec293483d
font_02_sfnt_off00010ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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