Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f044e49c972926e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 03:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5e5692c684afce6be139bffcc344900 SHA-1: 273f02e9e582b580262b53ec3752977c40f258b9 SHA-256: 4f044e49c972926e0fc99bcf3997f367ebb34e3cf39b8a3ce9e419e6f02bc17c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=telugu+movierulz+it PDF link annotation
    • http://constantemail.com/userfiles/file/1631354583jurexutesiv.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/rorubowuninawawowupifi.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/jupobakutijupogezoz.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/36960310975.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/81278449052.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/73614789183.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/tagokamotitud.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/sulefinikezurup.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/63840350882.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395a2277441---61943889301.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388a4b84a48---58012182096.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/bulakur.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021911954286794.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/77256916139.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/28888408904.pdfIn PDF document text
    • https://panoramabyty.cz/content/73833653694.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced10631ef---98392171986.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/jenunuxuvewatotamoga.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/58373328257.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/69817840412.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210916_220103.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/40728129494.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/nq14d7pn7scd1babm4n9spu5o3/sonivafogekoxa.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/47023130927.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/nozujorivasejeboga.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/4750853477.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_off0000b8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FC 15492 bytes
SHA-256: bc20b4b6c541e639f2e6bf2db67724a0ff3ef907cfe57d5ed1aed18a34e361ec
font_01_sfnt_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 10208 bytes
SHA-256: 45f0ddf7c3a413c1ab8b69dc1dac0d97d2cb262c9eaa41227f06db85f9c29433
font_02_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1