Malicious PDF — malware analysis report

Static analysis result for SHA-256 b045ab646521cbf3…

MALICIOUS

PDF

76.0 KB Created: 2021-09-22 10:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91be14a525699fa2115d0868b42c3b29 SHA-1: 84fe3c91d0dd2f46c1f75da78daf972ad507a854 SHA-256: b045ab646521cbf3c7d8ab34e6d612d0bd7ec1f3e76d007f9f15e8fa50eaac96
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML_NYX_PDF_MALICIOUS and SE_SECRET_RECOVERY_LURE, indicating a high likelihood of malicious intent. The document's content, though heavily obfuscated in the provided excerpt, is described by heuristics as a lure for recovery secrets, private keys, or backup codes. The presence of numerous external URIs, some pointing to compromised CMS uploads and link farms, further supports a phishing or credential harvesting attack pattern. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://dgjinhak.kr/DATA/upload/files/202109201111578805.pdf In PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/98085455054.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/vokiraxopajogigiru.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/66274737522.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/51281512433.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/37122595807.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/621a79397df672ae21a08595b7f036d3/76636051518.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356b7d97fbd---geketufejoru.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161359cb3ab3f5---gomasuliwipet.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/digitewox.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/govozibopibonasade.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/bedabetafosaba.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/90313454290.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/31303843227.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/disuwezawetebasezaz.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/petesadalinipowusova.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614028e76e5fb---doberigutekibik.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/gojevosuletirigelekegur.pdfIn PDF document text
    • https://ccskin.com/geektic/files/bisigidamaduzalezuxegifif.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/2813969093.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/1203401918.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zumugun.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161451dd833aee---fufudadofub.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/kaxedexufa.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/berajesefusekepobiliga.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/45843344513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ef+file+manager+apkPDF 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_off0000c707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 10392 bytes
SHA-256: 82fc79948033f498b6eb8493efa6f05c80d830d9fa1828c4d0173119afc50344
font_01_sfnt_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 16924 bytes
SHA-256: bb8f557dddaaea39ca02fe13b0e097bc051d5eb5c383173637d144cddddc5b13
font_02_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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