Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6ca9a394391c71…

MALICIOUS

PDF

95.2 KB Created: 2021-09-20 07:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 716d030cb5e4a36797a1e95bce5f7855 SHA-1: f6529054a79ceb09f49c01dfdef4b8a733114842 SHA-256: 6b6ca9a394391c716486f1ec03f36cef14ddde56eb5d6d29dfa0377083eeb14e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the latter identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://oolong-dining-co.com/webroot/editor-uploads/files/56034279627.pdf In PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/34551412005.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/leraluwam.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/wurumavesefamopob.pdfIn PDF document text
    • http://domexpo.ru/up/file/vaxotef.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/92088114405.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/99966506222.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147d28996512---fuloweliditunagofojivuw.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/mametad.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/69964517682.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d3ec91df224bde87be18673405ae5f68/jeribuxij.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8aqdbe8pks3c3ivkicee2m2875/sefamofoburamuxotivotoz.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/tuwofufapilatewibopovu.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/15354533794.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/sejunajoduwegajakasajikow.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/lonufoxokenivafuluxiz.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/35562328608.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/76348458369.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4f64s2ufri6ughdtdr7ihthiq0/47257969141.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/fovofokapojotevepasi.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/23894659627.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/36356343390.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/dalizag.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/59672448624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=boku+no+hero+academia+the+movie+3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 10904 bytes
SHA-256: df822014f32c0a237bda094500a745dd9a5348bee3e1d72c2e7b75cddc04aa3e
font_02_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_03_sfnt_off0001358b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358B 21464 bytes
SHA-256: e4dbd77b52d9f801738ad5bf64be7d1e407d05de288c7de54cb0ece50e5998ec

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