Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd238341493fafad…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 07:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40b4b08bad688a721201a7cc6b043340 SHA-1: 74c7f4fdf14b4920cf45f71755662c280d566de4 SHA-256: cd238341493fafadc8c160311f388030fa54338248517ea14d55d25e74d1c863
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final destination and distribute malicious content. The presence of numerous external URIs and the 'link farm' heuristic indicate a redirection mechanism likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://surtek.biz/image/files/20150228_101613.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ei25796pmd588bdm9mrafv9j91/sizoxuvigodoxejosuj.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607623795c00d---2271399219.pdfIn PDF document text
    • http://kco.su/userfiles/file/keseponatovobujiwafega.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/29981320994.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160797dbd9c5e0---kovulogilixe.pdfIn PDF document text
    • https://medpressa.ru/files/file/velilofopofamiwe.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/rulelesavebefipud.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/fovimezoruxixefevosebus.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a778a4e627---juliloto.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/56247200000.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/lalenomurenaporapo.pdfIn PDF document text
    • http://livestocktool.com/d/files/fejobuvazawuv.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/90f5d92c4dc7f82d85654a4e36264d57/25313237904.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/tejibelodovinekaxet.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb81e85af0---81242433224.pdfIn PDF document text
    • http://skomi.ru/img/files/file/54476056295.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f3726395---revutowotilawojasike.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607584ef11d9f---pafepot.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/81485724977.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/479695f781c53b911928332eeab6c873/14646768735.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210522200815595879n8vp46.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/53016628132.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/42100474022.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/1997921873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gulliver+du+k%C3%BD+pdfPDF 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_off0000c57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57E 20360 bytes
SHA-256: 98dfc152c1e2d4afeb22ef68f0b92c7b7366ee032bbedaa94867241fc4271a00
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 10268 bytes
SHA-256: 1e3850238800227e1b96b93533c1fcfd79492ce3ba63c9de1253eaa317a3bca5

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