Malicious PDF — malware analysis report

Static analysis result for SHA-256 0100c8c38bac57ff…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 14:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 597ba12a859407abae1b1b1f29da67a5 SHA-1: ff5860770fecd60277abec33c2f1719170840762 SHA-256: 0100c8c38bac57ff5cb9fc09e58f8b85aa4d064264ce42de04d635866cab75ed
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of a link farm on disposable hosting indicates a tactic to evade detection and distribute malicious content.

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 http://travelport.pl/userfiles//file/15758231049.pdf In PDF document text
    • https://callalilyvn.com/upload/files/wewovatawim.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/70223468367.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be81238fab7---pesiniwenutosumefomof.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609222f45f900---jabukujurubutuva.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/legasijafut.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/xezasadawudosazizixavemig.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d9fc096b5b073fc027c431387d601bfe/telukoboduzopupifijemose.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/dilozofasulosevorexagemak.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/kovekolabifobizurumufa.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41d034e279---lubusoju.pdfIn PDF document text
    • https://defaico.com/d/files/diludazilewozituka.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210723_D8EDC08644CE91F8.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210803_025923.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/87532719985.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/muwefabedabepixitudam.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a9bb5e3406fb6992a3f5f9c1b5c56bb8/xuxefiresisumozivisumugiw.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/26296366324.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b263394b37---tisijujomanujipagezodafap.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/wojaso.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210529_B6C68E3758E2577B.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160726c8d719ee---50663087550.pdfIn PDF document text
    • http://rnralpha.cz/res/file/lofibedibigota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rutina+diaria+de+un+estudiante+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_off0000b11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC932 10472 bytes
SHA-256: f9d6a08c411f161c66d9063f50f45eed4b6e640bcedb38d644aab984c657f99a
font_02_sfnt_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 15660 bytes
SHA-256: 4006216a7d33e7bc4d7a38a98f5a41c35a134d9290d41bc6a3948d026fc290d1

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