Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cc2310213a526e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 14:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e0a581250b2c1ed4a8ad970270600f59 SHA-1: 7cb620532bc60b762d4f8d67c3dbdbe7d1e024af SHA-256: 01cc2310213a526ed2ae09b509bd133867a3a71145e2e907ab4ebe31f5d307a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://marathonroller.com/userfiles/files/vumigepofobem.pdf In PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/ponuwom.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/mujaremuvivapaz.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd3484759---gixugudaze.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/78938233173.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/guwutuma.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c43d7177---87933429217.pdfIn PDF document text
    • http://4darchitecture.org/img/all/32497359956.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/tevebiji.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5415a80e01---79872759822.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/45011405521.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/jomoredizabif.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe7f33d3a---10534258839.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/1408886126.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210802_613D1E8FCC0CE267.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/13238310848.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cbce86e4c---vafijirure.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/di0l8l5og247kv7upr7ki21oht/zipugemuwozezir.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bd5a43950---42837546929.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/42392185282.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/vixukuf.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/gef56g0s89d5ldk1uctoom2sp3/wofejatugolisan.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/orhedvpsai39rpqola195u8ok7/23318138368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=que+es+el+acido+clorhidrico+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_off0000b954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB954 10676 bytes
SHA-256: d768fc544b74fd00e9af4c88b20eeabdad8e8ddd75084179ee45b78b74a7aaaa
font_01_sfnt_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 17276 bytes
SHA-256: e56e4dfe4a048f545509ec8880ee096a4d455e1087e5c6f4ca7b0ce2d21688e6

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