Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f364fbb49678266…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 06:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ac4f58e8f40b9b5b0c9b907c7fbe1af SHA-1: f19e42a62da2eec2d343a15fc37d6af77ee6ffcb SHA-256: 6f364fbb4967826687d76d2791e6e429c4b0d94eae5103ef244c2bdd5fc8aeb9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The presence of a link farm on compromised CMS upload storage further supports this, as it's a common tactic for distributing malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alicantea.centralcms.cloud/galeria/files/sorobapejesusovap.pdf In PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210908_F07454A053EE1925.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/kigupomixaraderike.pdfIn PDF document text
    • http://handgun.ee/media/file/21426560527.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/gimoleruminetikusaximuzu.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/wezawigapuxosasu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/kcftcdl0dumcto6i4adlf4oc3d/nexalelopetikibaparima.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/59159173012.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/xevevinem.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/62254714111.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/60522756106.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c71f1c052---jepolelokurada.pdfIn PDF document text
    • http://ipllaser.in/uploads/65001272851.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/88547818508.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/fatolivesa.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/69093233051.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/renegekegadad.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/81294935984.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/gerujar.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/53122706684.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/mebatukeput.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/vamipaloboreb.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/29443082140.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/52fb47ed7f2a8d2f46fab4975040edd4/66758120756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+hacking+app+for+androidPDF 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_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 10656 bytes
SHA-256: d69bbe80b626ef0e3f22db1295cd9e35abcdfb34a78b7b82aa9688099ab3b73d
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 17564 bytes
SHA-256: e20b4f3f5928b4f367611292adce6eb56faa14a3fad5161d763b2130f2112374