Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62ce6482dc67a34…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 14:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8a8e31b4655a73a3ba1c1d08b347084 SHA-1: 76275ea16988430945eae31071f1bcb0a4ca86f5 SHA-256: a62ce6482dc67a34a6a3dc23df0af2885000768460e51e284a141891f6feb8d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common tactic of using compromised sites to host malicious files or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=android+11+64+bit PDF link annotation
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140289fd9a8c---98067820053.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/somuzirukemun.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/xidosisinogepol.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///85682075754.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161301b208d190---zudiw.pdfIn PDF document text
    • http://www.og2c.com/images/file/5178759018.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/saxovetesutixalajedile.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/zadepupisevipepizobudiwa.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/pasolaxeburosoxap.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/getebetiteroxapebelabege.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/70056763077.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/17759696806.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/77296759873.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/vabekuxoneludot.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/26594195483.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/vopogepikusowol.pdfIn PDF document text
    • http://robedecreateur.com/img/files/79887072768.pdfIn PDF document text
    • https://ikansambel.com/contents/files/82822383016.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d958d3afa5---73676264296.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/sexubum.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bf44471e4---davitejuni.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/joxipedumepirerasuliv.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/10526279174.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/24316208948.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_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 19188 bytes
SHA-256: f4ae10fc0ba9436d0e6c27effd8f7172dd9103621e5429c68227ef36c5614ad4
font_01_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 10152 bytes
SHA-256: 57e54b64dd8015bd3cee9281e5c8d77d8afa1e0d89a508334f9ac2a9bf5381c1
font_02_sfnt_off00011b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1