Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc992cd00aae2b4…

MALICIOUS

PDF

111.4 KB Created: 2021-06-30 17:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b9c7e652521b36b0db43368221faca9 SHA-1: 0bae7928375c0ed18862978c3fe1422feaafa022 SHA-256: edc992cd00aae2b4e188c0c8c937fd1631f16df95f4cac4bee1e5fc1504b8ca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b6ee9f5d0c0a4be8c29c4ac47bd7a1e2/4976073426.pdf In PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/23382651885.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085b47800ce7---85088281868.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/66181078557.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1f4b07634---xarubo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11afd31ae8---8584948642.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/tusanerifosijogefujo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3f543b54---bovotabedonit.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/95637673196.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/34760298930.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160839b5501e81---nifodiximomujidazusubana.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zuxujalomigaxum.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882c1e0331d---roxeruwag.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde91894b40---filurenuxerurojamuru.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/452cf86ce79cfefa279a7e96ddea0767/24507417587.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8525995b2e---22369305505.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c760e85c2---66337840668.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/87369473002.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160890d681af1f---41276195204.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210514083411.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/jenuxofirojemekebel.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b53e8f4c6---jakesofutanelusinoj.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c793f85185a---22251449293.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/df5474677fa00219416c3152b6c8042f/mepudakuvunexe.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/gisasarapujiwowimolefi.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a9c5cca403b7d3f7e8b77a6673369fe6/gajamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=uss+defiant+weaponsPDF link annotation
    • 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_off00015060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15060 10440 bytes
SHA-256: 07ad393af98066c60c7fc3349f5777375fc01e3bc2a88bce54dd2471537cfca1
font_01_sfnt_off00016838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16838 18236 bytes
SHA-256: 3b8310eb1b74f5a07e2116b098ac97072140c79415584ecedf553e2f00420b05
font_02_sfnt_off00019865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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