Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd30632efb893945…

MALICIOUS

PDF

80.5 KB Created: 2021-08-29 12:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a33133dd7e188239ed7e62cdb206d79 SHA-1: 7664a127a35a57beb7d1f87215ecb24bb1ff537f SHA-256: cd30632efb893945f0ef57d2296be064e0dd290981c6fee2d0e1658cea82522d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://zulassungsservice4you.de/bilder/file/tuloketigu.pdf In PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/21575381386.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/dulaberoxunipozup.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/sakeb.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9789af01d7---poforejuweluzir.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0jqdskbkg0vmod8i4ktr951rtt/nixapopumofixoruwosegoxu.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2202150e5---loperux.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/4l41fmfvr8aj13r0jslu8kmjeh/bolokofodam.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/wugexorawemu.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/9mk0e2jv1fqbpd8aj9bg19vma1/22941475651.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/dasidafoxesusoto.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021082509133173499.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/4079569970.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16118812d23284---70727725488.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/dakixosumibaz.pdfIn PDF document text
    • http://mesterek.net/tmp/16510683994.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c7206d44---sutuxaxiviwu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/df20f71439744c6ec32e1dea89c52114/90796315461.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/72114718867.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210822_085021.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a4f02e931ef7a629c532e92e7050f626/vevakisopesuxubukikiribul.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/wejonubuzavilemogob.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062609124473499.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/10767003606.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca6af82874---pedekodudumutiloxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+charlee+lifestyle+hotelPDF 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_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 17548 bytes
SHA-256: 14c3a0d53aeb210e45ea43663c514a83984cb2c0125744126f67697e3c1c5746
font_02_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 10404 bytes
SHA-256: b6d732defae8cce4349ceef2828e1ad9bf5c32d29fd751d5e1045cbd2a4045fc