Malicious PDF — malware analysis report

Static analysis result for SHA-256 61228ff367504cdd…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 13:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3408180a71e141974bb0464efc280b5 SHA-1: 3ae64c63f29f5bae5f54305895fe06b6bf855579 SHA-256: 61228ff367504cdda0ea5ffd24bcaea281eb796447d58a5e2665ac1f0ebf371e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://turinimoti.com/assets/userfiles/file/wuvebalikawanufuruxemotam.pdf In PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f2b997ef4ac083345d6b374867b54f1/satewanixapanidiris.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/93929964396.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/lofav.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/24346553293.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/fuzivadigefivubiga.pdfIn PDF document text
    • http://patroha.hu/file/sudejutifij.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/39918648335.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/zidugugixuvobojoparuj.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/92598456846.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/romefepejikom.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/ranesomi.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/40193965507.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/4249574964.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///4836668127.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/deluwelotomuwigep.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/pusadidafesawuwukodi.pdfIn PDF document text
    • http://idroter.org/userfiles/files/95454219377.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7f3c3047---36587273328.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jadid.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6b1b9775c---60844545129.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/43919408171.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/q3r7bppdednppkfstqeradvh0m/zoxisiba.pdfIn PDF document text
    • https://quizai.com/uploads/files/74666296291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=genymotion+with+virtualboxPDF 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_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 18764 bytes
SHA-256: 6bbac2583dcb9698a2db93a7db5038056809ce1106db21f2b09114ad8cbb8ef9
font_01_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 10852 bytes
SHA-256: 93126adc7a0463fa25f0d7cd9a74994407cccd727c7b4c3f4051728019097808
font_02_sfnt_off00013501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1