Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4fc8046596c0d0…

MALICIOUS

PDF

69.5 KB Created: 2021-09-21 04:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd422135184330d03e6d4f0efd3c11f6 SHA-1: ec95779f35d0f8c2206e0e60259552a07f121dc8 SHA-256: dd4fc8046596c0d04851880beffdd6c193fccfdaf187d5529c29d35bab47fed3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sochisushi.nl/survey/userfiles/files/rolujetakalar.pdf In PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/85520886793.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/xakenato.pdfIn PDF document text
    • http://prosquash.by/data/19699820654.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/01c34ebc827243aa72d63831845528a1/pegaxebemokubuvus.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dbe0919ea---naxovusawarudelesen.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161327d3cc0203---97941145879.pdfIn PDF document text
    • https://brakos.it/file/fapivekukijonotare.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/laralipabewapegumivil.pdfIn PDF document text
    • http://topflexsports.com/uploads/zixenesezixunemuburabole.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c91334fe5111af010eac3f55d6571484/wiluloziloner.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/tolipaze.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/83657712535.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/koluxamipixevosaneza.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454300a82f6---76419908751.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/44ebb2aa5a388861db9945cdd958dfcc/padifu.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/58515816138.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/9330371836139a4b64555a.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/lifikipidogugerete.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/48625162360.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/1519335879.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/54858393548.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/25320894259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gangster+mod+apkPDF 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_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 14600 bytes
SHA-256: b48a8bfc3230a2467e9a11e162722c860eacc9eb668d8c0c766aa3198c1a2d08
font_01_sfnt_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 10728 bytes
SHA-256: 56169a604907461ede1c0c0dbd39277ef21932c1d1f7585b8c1e34e38918e228