Malicious PDF — malware analysis report

Static analysis result for SHA-256 658d282e63bae547…

MALICIOUS

PDF

82.0 KB Created: 2021-08-25 15:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3111c35317b35e663a48994479b984da SHA-1: d76d5758844bf97bb7ad1f1f85df229f0511c8e7 SHA-256: 658d282e63bae547d478ac35c7e53023f10699879de550ce8fb51d44a9c77e46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to host or link to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://krisoc.ru/uplcv?utm_term=image+of+digestive+system+of+human PDF link annotation
    • http://artepcb.com/upload/files/43668693690.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/91161448026.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/fufugon.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97a71b3bf---13285118291.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/fidiruguwaka.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/hkvf4rjlbiln3rh757dls18q2o/91889204300.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b15fe88321e84d554f412b852932de69/rizaxivuwete.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/93210095929.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d51926fed---gekuvaxezi.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/66631042249.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/49277523494.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b887ea95ced---bawisojazofopo.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/17257243418.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/507ba3b945b6bfb199a7294f851f7703/85698181873.pdfIn PDF document text
    • http://kkitv.com/images/upload/File/7089263692.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/546f6bb14521281f51b6f79909e1bc66/fefoxufovotilavisejo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608339d7559a9---24151614945.pdfIn PDF document text
    • http://novichiha.ru/pic/file/77298572982.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/16202196511.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/mufapofogena.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/bonawesovuroju.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ed1a5kkq52giqhib2vsjh4o75v/jowiwokisukajuwekajer.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/60797077472.pdfIn PDF document text
    • 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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 16524 bytes
SHA-256: 8e427f1d1661a58e84af6c05e160d8ff8105ba844fe9afcaea410cb29d856d07
font_01_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 10888 bytes
SHA-256: 6c378a6812be2e13375af174063b5ef3137d6d549d1b49e67e9bba0ed2e3cfe1
font_02_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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