Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2664f9c3ff4bcc…

MALICIOUS

PDF

91.1 KB Created: 2021-07-27 14:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76611f2bd7b4faed8534ebe557278671 SHA-1: 41c3212a9dbf39d8faba8b85a93029970278d80b SHA-256: ef2664f9c3ff4bcca9152e14daf8075185543cde06c07aa1cc96a6990bd47109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable binary data, but the heuristic firings clearly identify the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/0lqtifi7a4h2oh6ik6b0n22j4j/bovenuwulezebabefekobitaj.pdf In PDF document text
    • http://frangarcia.eu/upload/file/21214888999.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607893a88105a---233436079.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/13156127947.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/38698984754.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b52a2b8ab---94784293078.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5149ad51653746cfe37d76a2c810113a/30644019273.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/leturijogefit.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/zuwazedaribegis.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b5299f343c27332d25296ce6439e1164/zazibijekija.pdfIn PDF document text
    • https://aspirans.com/files/file/72670225326.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/revofewujagamaw.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/3oumip5k5neatvsi00q8gv77iq/vabajideranibusasesotojaw.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/ronafiluxapager.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/teziliga.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ac40ievrh1qbmnnmn00a3lole7/2298821684.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/jorogeradugo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/caodtb4m0nt4o8hrd66eshpbe0/turifop.pdfIn PDF document text
    • http://metapolar.hu/tmp/34651016591.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021072216269740641.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/jiveduvilesodajifewezeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+are+some+characteristics+of+metaphysical+poemsPDF 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_off000101f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F1 10748 bytes
SHA-256: 6316015e92604d9d4d6557356a551dee0e6ef2df02ec84900cf1bf16d751b902
font_01_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16928 bytes
SHA-256: d5e70eb15596f6af715f94d2744b8fb48f59c664a8efd9c37398b85f88b618c5
font_02_sfnt_off00014694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1