Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecea81325508c1ec…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 02:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f264c48403f6f98fa4cb5e5a76d2e1c SHA-1: 292898416e5248048499e9880dccd3c4d417f530 SHA-256: ecea81325508c1ecbc04236e61e5200d06c7a7c9fc7f590cd3799717014edad9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate the PDF acts as a link farm, pointing to compromised websites and disposable hosting, suggesting an intent to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hb-hospital.com/file_upload/fck_upfile/file/kuxajulitebowanimumumimek.pdf In PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/ruvofux.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/90687139327.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/xedovenaxale.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/81595508645.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/wevafa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146757b109a1---2115794083.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1f9f93bb2eda19ca0ae414bb27f3eb8a/23847352625.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17108343e85a296aecd7a1fb103cb97a/valigabototiri.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/vizij.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/xefopebisesalajenon.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/losizemesopoxu.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/38246995635.pdfIn PDF document text
    • http://cosyromania.com/media/file/mejid.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/17288094694.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/8397583376.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/43910047592.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/36453029079.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/fareguwufe.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/19990765701.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/nogevenajol.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/32605676501.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/vojujewuxako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=zelda+breath+of+the+wild+wii+u+isoPDF 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_off0000c748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC748 10636 bytes
SHA-256: ec94093d6d6b8b3a48188c0afc83523840e22990fd73bfbdf696dfeec244eed5
font_01_sfnt_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 19904 bytes
SHA-256: c2b515ba20c9e6a830c77888d15ffb374f86c5ccec33e4bf5cd5675280694774

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