Malicious PDF — malware analysis report

Static analysis result for SHA-256 94319b1ff22985f4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 22:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07b82fe72c56a048bc3cc383ca0e252d SHA-1: c3270cd2bf6c47564cc05d460e9ced53c5d139c4 SHA-256: 94319b1ff22985f41b5822eca829b10f5c9f85bb4782cfd0552102f21a8d7368
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=termux+similar+apps PDF link annotation
    • http://caydinhlang.net/userfiles/image/file/limonoraxojumunex.pdfIn PDF document text
    • http://klhl.com/userfiles/file/93198938414.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/84403286433.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/namoraboruvigapore.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136638f800ff---nuzemifibegutoduwotosexel.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/99020743209.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/92642278358.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/88684719734.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/nofopirozidiguz.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/42105624595.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140134aee69f---29028552791.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/53252436535.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/botijeduvu.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/43396430852.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/gutojikokobojog.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/bujedagotukubizeguviwot.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd9ccc1e6---gililodujed.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138f12306592---xulopos.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/vunudejibe.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/milesite.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/80071249582.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/35647865590.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/zagodunines.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_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 10256 bytes
SHA-256: 1a4232bf9dd8f73e6bd5e42ee86c1fc332241749d4b4e1c26a8b9cac02fdb005
font_02_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 17496 bytes
SHA-256: 46504ec577eab30869847f380f32998883c09e973b8576f767ca9a472f7fe26e