Malicious PDF — malware analysis report

Static analysis result for SHA-256 b283ea2e2ce8821b…

MALICIOUS

PDF

92.5 KB Created: 2021-09-22 12:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68d3b25a4f50473cb24c3aabe591dc45 SHA-1: f26e44f7edb993ec81c148bf9c05ce0a41fe98b5 SHA-256: b283ea2e2ce8821b49a542d5a568fad61827ef8e1f412a4f35fd789c24a24482
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://valgott.com/images/userfiles/file/waluvotuzunonebabaw.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16146941825d93---88557498131.pdfIn PDF document text
    • http://hidramaco.com/files/files/84061452432.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/53818076194.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/ririnek.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16147f732986ef---jugarufafubof.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/48738564899.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/cb4c88c55ebad668e5e861f4ae090f12/65091154815.pdfIn PDF document text
    • https://mmtours.si/uploads/laxipekakojifugozewejaz.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/52424483334.pdfIn PDF document text
    • https://go2germany.ru/files/file/zelufodedimogonu.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/zarurumimizeput.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210917180443.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/norotelunogurijav.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/nowotesuwifomelotizi.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/86019436239.pdfIn PDF document text
    • http://belean.pl/userfiles/file/didakime.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/xawekivokiridub.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/nuwotesofuxuja.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/lujijegutumebakemid.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/70794726944.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/bazopudakejupunuzikixu.pdfIn PDF document text
    • https://matrixx.lu/images/27409060296.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/lesexikajejejaxosono.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/xejus.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/6989682106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=change+apk+icon+onlinePDF 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_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 10412 bytes
SHA-256: 8fb376a9cd01359f74dce7a8607b07161254832b62998dc2d556c15c9d63bb43
font_01_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 18620 bytes
SHA-256: 8cda8397d71435755d8742b345d5cb80b6f49b894837848f8a34ec28e4f29c3a
font_02_sfnt_off00014c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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