Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b0a432aa30aefc…

MALICIOUS

PDF

83.4 KB Created: 2021-08-14 23:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f239bc77d5a9f232ded07e2d8281679 SHA-1: acb71febef97012abb2ec6fb8a9ed26073a57355 SHA-256: d4b0a432aa30aefc4ca5180bdf45e57b2cda8366ade8428f2343f9e8a72638e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the PDF's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=can+you+connect+a+sony+subwoofer+to+a+samsung+soundbar PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27b22d6d1f---kuvifinomejivosetakojufo.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/62706840808.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/53063443173.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/kojizadovu.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/kf3e4hd3poc18bch4bj0nqtgte/6012507130.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/sizolifefirefav.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/717235a22f13ddc434efb850fee3c5f6/lisarezabukomixodatanuto.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/lujimevomol.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/68477136021.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/12973830413.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/53976980704.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088088edf8d6---92344292671.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609042f489815---fuzowozatifowuguwe.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/voperexajizosolobab.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/290aecb198bd5119144049b5c9f0a080/roxanitolofoximegotu.pdfIn PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/77276088812.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/vagagud.pdfIn PDF document text
    • https://lesura.net/userfiles/file/83371693549.pdfIn PDF document text
    • http://clingac.es/d/files/robitimode.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f08b6444---84666371515.pdfIn PDF document text
    • http://asqcert.net/files/files/lubifabipadavifep.pdfIn PDF document text
    • http://imaginove.eu/data/Files/letokugirijazonej.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f17f29df1---1195534030.pdfIn PDF document text
    • 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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 11152 bytes
SHA-256: 23e991b966f1941882ba0013dd92e0a867154e314c06f0d19c4d4351027ac47c
font_01_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 16928 bytes
SHA-256: b4ea6f1a945b81127a442b878e236e6cce00a511e88507c1d02d8166c6f0d54c

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