Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d20937c68d106f6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 21:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 723313713e88b990168f1ba27297c116 SHA-1: e12409bd144244eeeef296a0b3c7b76e6d620535 SHA-256: 1d20937c68d106f6ac0a0e33cf90208274b84e64ec7de8005a816a3303f89fca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://smidgel.ru/uplcv?utm_term=niazi+tv+apk+download PDF link annotation
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301796d80d5---vukeguwonidobonido.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/72477676916.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/sutejolimatez.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f644622d0---jogelotuperurasevadadisoz.pdfIn PDF document text
    • https://dukupahit.com/contents/files/wipozogobunuwigu.pdfIn PDF document text
    • https://stopserv.ru/files/file/fudagedopupumeg.pdfIn PDF document text
    • http://vo23.ru/upload/file/vatagib.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/jipokokilorupuvukoguw.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/48845098603.pdfIn PDF document text
    • http://rentaruedas.com/files/others/40668431678.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210908_0EB2203A2D2CE31A.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/wupekunuzesese.pdfIn PDF document text
    • https://petikdaun.com/contents/files/5585731863.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161306dbb813fb---nunazavomutazuvajegunemiv.pdfIn PDF document text
    • http://ellev.fr/upload/files/nopudaxabapesepedava.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/rarojamesidopebenofer.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/90239552314.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161381e274405e---tubatexagarudomurenidi.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/4560371920.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/36544408927.pdfIn PDF document text
    • http://vlajamo.cz/images/file/bopujojakoganamawekuret.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/28339407662.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/rixugivuzexi.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_off0000b322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 14628 bytes
SHA-256: 8a1ef20a4477b49a19caf4aeb1ebeaf7566de3cc9eb1ac1002a354d9493b8ac0
font_02_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 10264 bytes
SHA-256: e85327e23f9a1f79448dc27369a89aa5792b4ca6c471390c48f088c1f9fd3ae5