Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78d3991d2fdddf9…

MALICIOUS

PDF

121.5 KB Created: 2021-06-29 06:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6b15a8535f7bedefa90cf83efecac798 SHA-1: a8885c407e842eb918cb23ff015c445bb116114b SHA-256: b78d3991d2fdddf9ef224afa1f7fa32424e898a458f7bf31a6c636d49e87cda8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage attack designed to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 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://infrive.ru/uplcv?utm_term=williams+edwards+deming PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8340a1d5c---varovisak.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe67a63ff3---kezonufiguwimur.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/dumukalonujofevot.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f4d84acb1---95183748206.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/15198877245.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/71003853178.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c1d72e31---44968584200.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/42870755136.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xuguxuwegidum.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fdce7f9b07415ac758448bcd68ad7739/munavotatapujerato.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/tixowibogurufonamafasaf.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/541a1e6bac7a2352d0c172b531efd345/kenaduzudifixebuwopodexe.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ce82a34b---dugedizigifusevebe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3f0a8105---77364533929.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbf3d7030---67683432579.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7db10f476---bojoxuja.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88e3db1ca6---minunugalodenex.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608423020ec42---mabure.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/pedebebaxinisokofofed.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/3155942353.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/724a4715922890a27d1a1b990e4a4a48/wotexojamebatamelixan.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/21f0f3b8c0a779c5506d86ec0c5a8270/35645417711.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bc99156834c---godalagurejobapu.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_off0001774c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1774C 18736 bytes
SHA-256: d95a792a43c884f8474539c6c7747a99aeea002bc605e57509f2589660b5a736
font_01_sfnt_off0001a95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A95D 10452 bytes
SHA-256: 940ebeeac78c3b8b809369da1eb41eeee2489094b11776ef6ba5ba5b1e0376e1
font_02_sfnt_off0001c0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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