Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8472eda0bf77e8b…

MALICIOUS

PDF

84.3 KB Created: 2021-07-14 04:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c01ae9aa34cf509c7cac8186230a355c SHA-1: b4dcf9662e99ae51adf199ea7dfaf4c8a1c28219 SHA-256: a8472eda0bf77e8b831c710bf588002c0b10289d0f7a29b8e73d1d98982e8b95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://sukhayurveda.in/userfiles/file/39577835551.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b28892c12c2---26931367105.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3da9a560---69031525153.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b9802d51---55489314071.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/rukejeguzepoxaxobabufole.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/keduremifutezebiwikexin.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2fa972259c2d77ca1612b70a5b6cc5e6/57377243621.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/98950691129.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/is0l77rt3rts9ho0ioeuh8eehu/zaxilunub.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/96080143015.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/zukadi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a284ec21909---xovidijujil.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/bikenemofaguxikegoveref.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db2dd3ff04---63498549325.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5a833de19827bfc65cc1f1260c6d43f7/fujatijamo.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/jowixagiroxijibutuboteso.pdfIn PDF document text
    • https://subarini.ro/mm/file/46509693498.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c8c4a13e0e2---98165360045.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/65980572716.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/bupefiruk.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vilona.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/lomebebipewazarojaxi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cead60dfb---tekewopaw.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074b428ab6da---62910989429.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085236926109---garezafulox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=which+what+if+analysis+toolPDF 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_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 10392 bytes
SHA-256: c6e45c78a6f135880a41d076babc1ac3fc508c9ee0a002b4668ac092b23bec20
font_01_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 17152 bytes
SHA-256: 4766410bac7ff01d6f0049f61d92eaa98bc8979858110a44b067e65f1930f68e