Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6432a2c04eedde…

MALICIOUS

PDF

72.3 KB Created: 2021-07-09 16:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 65a32aa9344c2b7ff2f0bdc341d5c278 SHA-1: e1de770232d4f061bbe74fd0eeecb13f7324da38 SHA-256: 5f6432a2c04eedde7159b3c1c18ddc443c68cd4e02e8a6eb9bdbc92957e62475
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which host further PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16070c83c3dd10---86280391560.pdf In PDF document text
    • http://aire-limpio.com/img/editor/file/pubutazezilatukefuduguso.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/tajexiduwipimegetaxaliw.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077c83e288be---80830362336.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/tasolizufajinozib.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/sajaw.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760d4075c93---80469597512.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/lejoxetenoluse.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b5fe216d5b7f22d15dc9b0a058489415/wuvitowawopepi.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/5563636.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/popipumiluxazuwunuxati.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ap1khfmtpkp0dgbt0mf6cpsae3/45378174043.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/9337114050.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/317r8cek5ef7etec0vlr7l4f1c/furibakefomaxazimikadar.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6120455818---mukenitewezomerefuvuziwa.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/lizojaxubawakaj.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/juwanuluw.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e692adb5af7---66808422827.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eebded591---dalezanufuso.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/lidix.pdfIn PDF document text
    • https://ikansambel.com/contents//files/10221647722.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16082d89a7ebb8---subegabadivul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=1000+skips+a+day+burns+how+many+caloriesPDF 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_off0000b885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 11292 bytes
SHA-256: 1bd37cdb4d39a8f5999eb4282bac8bc5ba92b14b6cba81ad3bfd3255e16d1af5
font_01_sfnt_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 16068 bytes
SHA-256: 2113313d7de1ad7a281b021e3afe4d09017fb296ae7e60a8f1691500e325b0c2

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