Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7d2b02a8bf7790…

MALICIOUS

PDF

98.8 KB Created: 2021-09-14 04:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddd67f3324e227b6e054adedfafde5d4 SHA-1: 295ec34be3992a07611a6d3f44c4eb8fb5350223 SHA-256: 5c7d2b02a8bf77902bd3e6904bbc3bd9bc58ddfc0a1374d636a502aa597124f2
212 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 contains numerous links to external resources, several of which point to compromised WordPress upload directories, suggesting an attempt to host and distribute a secondary payload. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b86a09c3---4599812557.pdf In PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/xetidejobe.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/55906914699.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/19787034326.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/81461325104.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4f64dc0ef966af2f29ed668e01909e1d/kasovafufozemaxuzepoki.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/nqlbigtdm2o1gi5ig3f0oik0uo/88608508249.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/palenalanebefi.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109122203387509.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/67675670022.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/gewin.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/96530839294.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210905075612.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/lurejimevadaxivuwekasux.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/30c7f771187b315f620f738d8fb69833/razekojijusuj.pdfIn PDF document text
    • http://kim-clark.ru/files/file/25426910956.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/26575720341.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/zesuturoratupa.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/40213970955.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/vabunojune.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/dilogakuvobanagedavugereb.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7dd45eb82---4448923232.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/55413753824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pelli+choopulu+full+movie+with+english+subtitlesPDF 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_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 21900 bytes
SHA-256: dfb7e50b349ee85f9a31870087b2af3034ed4f5890a4bb9316b90f0a1e9a1fd8
font_02_sfnt_off00016388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16388 11060 bytes
SHA-256: 0261bea0d496d924ccb89b86a2dfd4356737753009161d708d9f8b2deb2c472f

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