Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61f2c761bb4bd5f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 16:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ee7bee6eee491353dcaf04e1afac7cd SHA-1: b715b5c474eaf7109117725d9ac8bdd2e2f33d99 SHA-256: e61f2c761bb4bd5f2c77129153df5af9c6ebe12d495b163c2860c1686e745610
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=after+read+online+free PDF link annotation
    • http://estatepie.com/files/userfiles/file/voxugubix.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/28678427995.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/67790796108.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/ragijabid.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/xexipavoripoxelunasixuwas.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/jepazinoma.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210908161002.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/tabipusagoduvumevozu.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/44887255213.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/mijesukapov.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/risipejel.pdfIn PDF document text
    • http://unibox.lv/files/text/dujirogezamek.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137d91577f58---palop.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/goporevam.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/bosoniluziditilobi.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/86744165918.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/unjqlqr7s6c93d79jo6jsf5ll4/8629430367.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/vujar.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/leporesodinukosuzetubaje.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/nelugujebopopagerawuwo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e22943f125555a81f95430d6a53fd4d0/92201371799.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/bujufojokadokiwimenajuruf.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/betaligege.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_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 18084 bytes
SHA-256: 56dc88262eb0aff039349a2a5157c13a4e0904f8d4fa599dca3541909f17bc93
font_01_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 10160 bytes
SHA-256: 37ce0563b01c985aa0bb61860646c26b198105fb3da936947019cbec1d479e28
font_02_sfnt_off00012ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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