Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8c8b7d49a47e68…

MALICIOUS

PDF

91.8 KB Created: 2021-06-21 00:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6bcabef13f9c4dc2acca51217a5cf95d SHA-1: f74b477e89fe2399bd0b7844f203987143204427 SHA-256: 7c8c8b7d49a47e68a5d4570cd699d08271dc6fc1ab324bac24912d55c32812ba
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which appear to be hosted on compromised CMS platforms or disposable domains. The presence of a 'download button' lure suggests an attempt to trick users into clicking these links, potentially leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=ilayaraja+jukebox+tamil+mp3+download PDF link annotation
    • http://agcslohian.com/userfiles/file/rurilukofipubipenemimofuk.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4ngbnne4e1rpvl6er4pjko91vi/pujuxos.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160780c56e2e27---rotemipefudavu.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/78467855574.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa95b8add---6990176527.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8bb0a329d---31535571384.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/80161957878.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f0a5064a---17694186933.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/91531545552.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1932d68792406bb03bf2cd6e1f168a54/45061550657.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/63fbe49a454d7616c79f44a9fa9d4057/26119999859.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c058c99084e---91078850341.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/katewixazaze.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/sobiserizebesokudowuvixik.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7b5da649ba77254b5594015425f79dc3/bejizajameneti.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/e4b049bec84c91d04272b25f8b0c2572/fimilanizevogo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c61905e6e53407a8f7847d1e36b9a482/gorobogigitipe.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079390be6d74---xaranosovapibuwakemes.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aac5a8790---manabodezexoja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 5568 bytes
SHA-256: c138c03bcf2a78a894cb8d1ae048605b6e6cc8317d5931dbd77a12c7d8380062
font_01_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 10896 bytes
SHA-256: 78e9f7a9a44824257b482603a2402825e153de25b51c9a559d57e844c22f7ffb
font_02_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 2468 bytes
SHA-256: 16555d16e05aaca00b83a86a7b930ea4ea51646da4cb80a6c3046523409d95d4
font_03_sfnt_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 10936 bytes
SHA-256: e40ea85d89873de23b439bafb27cba6799fd29cb2aa5aabf37a5bc1dd308662a
font_04_sfnt_off00013f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F24 19300 bytes
SHA-256: b6fbbafe86b70475d387cd0a7a59838d3286de3fb939aa6d1431c2dc01d2c172

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