Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bd65d9dbdd6935…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 07:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7bf6e1947256bc407067a4ba6fed3a0 SHA-1: 26459ba11ba7f83150ef7388a7aec569c9d3839f SHA-256: 44bd65d9dbdd69353143a1764596bda4435a1c26a617b4a8cca6609b57c5d273
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_RANDOM_URL_LINK' specifically points to a PDF hosted at 'http://developmentassociationofnagaland.org/nbloom/fckuploads/file/61655590758.pdf', which is likely the final payload or a further redirection. No scripts were extracted, but the extensive use of external links and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=periodic+table+download+hd+pdf PDF link annotation
    • http://zonazero.es/userfiles/file/51201195325.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a50fa8a88804f8d871bc23ebc8c3ae84/14339868794.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/id31206ej7pmeoso2rgkb5l533/44125292703.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/xizunajonekijap.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/baec65ec44184a6314bf175d60c2d4af/bavurunejafefi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e16604f193---82183215046.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/2969019632.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/13c68e78c759097a413d0d10f0247e45/59116442912.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4e681d4e---18731866389.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/16234434617.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/gaxuzavabevine.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/42849334864.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/59611674547.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5975cdb9f6cb267ae4f046e79c84132a/1576136966.pdfIn PDF document text
    • https://mfdesign.hu/files/file/sutirow.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161154cd9406f2---tafadupi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094330c7d043---vujotusiwanomivubunidaz.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lipf56og0ar18jttsq5l4v090r/fijizolixo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a686186f---xotirovanotodotadusasemuz.pdfIn PDF document text
    • https://kopari.hu/files/file/32136794782.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10bb19014b---vetamusipemavegelifarato.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/61655590758.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f18ecbe4bbfcf139d7c0b3b91c63894b/13501921663.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/30940619230.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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 17312 bytes
SHA-256: 33ec399a7776227b7ce6ed8953750ada513980358395cebcb24e1c58332f191d
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 10776 bytes
SHA-256: 01b7df6fb7b1116f6a9e713173a96ad4dcb6cb98dbc2286229e879caac3a47cb
font_02_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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