Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f7bd046c9dcd3d…

MALICIOUS

PDF

89.4 KB Created: 2021-08-01 01:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6285b21f89617aa35eb76a7f54046c23 SHA-1: fa06177094138e712a29f89d341d582239b6cf95 SHA-256: c5f7bd046c9dcd3d0915a95fd8437d3fd7c0411f133537eb0d4c9550c6a86d5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed for SEO manipulation or phishing. An embedded JavaScript stream was detected, which could be used to facilitate malicious redirects or exploit vulnerabilities. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://blackivy.pl/userfiles/file/vajafuxemisevefuwifutax.pdf In PDF document text
    • https://flying-vikings.net/UserFiles/file/3322309161.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/038b2d10aada30a508e53382191f00de/34637696578.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/97063944891.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad07cb8453d---guweloruvekugotiga.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/xodubusojesugozojonutizo.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/42513717892.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/reguf.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832ff6f869---vubajarok.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuzil.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/39814348521.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607910ba0b1a0---33418439065.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/22897331147.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/50a6cc607b87d4b74e26b66227bc1a2c/todalajasibofexida.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe848274aa0---40421673088.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ccb63c8b---92537270869.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/k7s5pmeisk9uvu6u84rlcnb9eh/82623246444.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/kivuvalaxejapepudajon.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0822779dd---forinuxaridetarubibo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ac982594179869f49d6182c48fdbe791/24585662096.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cd08ee66c9d4bfd4f30fe14b13243d76/41233734476.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ee472f18d70---wogokewilubij.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/99762443519.pdfIn PDF document text
    • http://unsersohn.ch/images/file/27976630879.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210715_6CF2B6A03C93D450.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/11490546761.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8v6s9vu91cpk7qmm7khdmrf2mr/fedimazejodolefijexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=doulci+v3+activation+code+chomikujPDF 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_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 16796 bytes
SHA-256: ee2abca67a3520591f2bfe885ceafba12077e35315ae5880fa80a1a73aca8166
font_01_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 10928 bytes
SHA-256: 5cce28ded97b7925a88ec49a4cb121e22620764d571a7c22faa5d12c18bb667a
font_02_sfnt_off00013c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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