Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f5d7aacad5f4d7…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 19:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 41a92f3b82223e041ae74e5537078fd9 SHA-1: 2b5596c9f385171df92fb676b4f1f13aec9e9263 SHA-256: c7f5d7aacad5f4d7bd9b6ee1711ccfa1c9561ee8619cd9d61459b0f978f70da7
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=mixed+modal+verbs+exercises+pdf+with+answers PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d0ac0f78c5a9696d2cae9d78207affca/wajobovub.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/25064609291.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/7028645162.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/naxuwa.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/98734757634.pdfIn PDF document text
    • http://xn--80aaab5bgii0ck.xn--p1ai/ckfinder/userfiles/files/58092487498.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/64864909287.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/zesamatatilufusovira.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210916135210555009dw6sv.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/38132991541.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/kelokiroki.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/43208482122.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148970321c77---19368781192.pdfIn PDF document text
    • http://baoveantam.info/upload/files/rinebomoxaxekuwukidapodij.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/vegebososemuzozoj.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/16572930458.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/24718357310.pdfIn PDF document text
    • https://2winit.com/Files/files/57585718731.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/fekasajelez.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/jupazafewisigi.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/nikirarexurabipekuf.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/30960845384.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e116a390f43e17ffe7dacc25b99365e3/650695336.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/75006067465.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_off0000bcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAD 11272 bytes
SHA-256: 877497eabb5476c5022f495d97c13baf30ab81d3732b3e53cbe9e8a68c3e1ce4
font_01_sfnt_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 17320 bytes
SHA-256: 3487e3d86bb5398f89ff89eae8d1a70e1d2f44459bf662695157ebf7195ed1fe
font_02_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1