Malicious PDF — malware analysis report

Static analysis result for SHA-256 294626386ba92630…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 02:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ba8a8ef72b6226705ed8de4ed01490e SHA-1: 1e104fd31ea21341e67386f092f358b71f159f5f SHA-256: 294626386ba92630800735fbff06974333154db2c4f3d1cdcaa06f6691714f3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to other PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO poisoning or distributing further malware. No scripts were extracted, but the presence of external links points to potential further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kramnyca.info/img/upload/editor/file/xonodozerujujiguga.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/673907e02e6be6d389b0e80e8815b68b/wewizutunikamewufikomodo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c29a9d0549---44970904195.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/xadelad.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/witusunexepivu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b07ae92403e---simab.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/jododokodadipimewob.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210702183458763.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/50c26bc92ca8f5278960c8467fb72233/bulusumasamidivime.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/3932193090.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/983be01713c5ac1f99f8bf2d7ecdaa66/fulizelusexegamegam.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/46f937bd48528953111ee712ad51279d/xobixenofovidegu.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/74702910319.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/xaxejexijo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160930eff3d885---87824340888.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/diwenedo.pdfIn PDF document text
    • https://service-panev.com/userfiles/65186165769.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3a702334---94620325292.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611c77f0175c0---luzijemido.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcaf6d894ba---sunisozugufijetixi.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/jajuraredonunekulox.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/46835540389.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a6a5efecd79af411b0c96e280fdb4dc7/vabak.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/91538268125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=halt+and+catch+fire+meaningPDF 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_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 17948 bytes
SHA-256: 0ab8e31639bf4cd429e734300acf5dc2a12f7ee78b3bdf9fd74e259e43b9dcc6
font_01_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 10628 bytes
SHA-256: 78372fa972277e1b53b532893619959400995e8aa7ac01e9ff222745ebc41e65
font_02_sfnt_off00013306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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