Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3762545ec96125…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 02:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0024262b8b7f1c51365b0d17b07ab2e7 SHA-1: ec82766f62949081f21b8a0706bbd771f1da032b SHA-256: 1e3762545ec96125e17481465fb20fda39f28299555ef9a3fba655fbc8f91a8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://burbank.kopanramen.com/uploads/files/lozolo.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcf89c45a4---36164876999.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/93883874622.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/lufarosapotezapasuvulun.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/wunerexizolatozuz.pdfIn PDF document text
    • http://opsir.eu/files/file/19989986859.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/72912379699.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/zajimepedawopagidewiroje.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7bc6b0272---44787326372.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/vemux.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/nudigomap.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1cd7a2ea---dalanewasuwis.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/lupol.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/sepofamadupejomo.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/70595651360.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/517jgnk163q5mmd8qa62a2867e/jazaxawi.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/lijobilisibasulegig.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/futivup.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/11497951122.pdfIn PDF document text
    • http://onelove.cz/file/fosefukodileduvi.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/59195306403.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/24334447477.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/11083354554.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/26751587043.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/kuworuxuwaril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=netzwerk+a1+kursbuch+l%C3%B6sungenPDF 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_off0000c766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC766 11020 bytes
SHA-256: 210a10172be2a327e8d81a4ff7d34975db76e7242c1b5facae64cd229f28ee1e
font_01_sfnt_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 19648 bytes
SHA-256: ab83571c455cb9522d8bb8a235a52decc24fdb788c6697609fe8a0681438aa2b
font_02_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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