Malicious PDF — malware analysis report

Static analysis result for SHA-256 979f111adedb914c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 05:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b0ca7ad1f171845f3ad08eca440404c SHA-1: 33979f21bde56561e380aacc26d6d7ce15dd77c3 SHA-256: 979f111adedb914c190858f3dc72513f6384b1da52dd1af04d5803264d7ebf25
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830388a3834---63605629290.pdf In PDF document text
    • http://3xlove.com/uploadfile/file/40438899631.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8a957966---doxozijonowadusidibem.pdfIn PDF document text
    • http://proxima-design.cz/files/file/16168885325.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/lalugawulo.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-2/20210502204600370929.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/dokebiwofob.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/rafokujapalagitu.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/varugisodobirudi.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/54972814855.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f87086d5a33d98b7863dc341ffb62a6c/75386639914.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/77138651799.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160851ef373ed2---xupub.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c11a03391---38011081398.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/98414995716.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/364620fdb6bb9bdd1062e639c4142847/muxigawaj.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd62817275---babidutovilajojuwejawige.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/dopuxuvopiputumopalavi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/hbp0setgpiaehmv1e2s4789cq1/xuragikotoxanemafiz.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/73474721812.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc4ac18b7---kowejetiworaseja.pdfIn PDF document text
    • http://skinanniversarymall.com/userfiles/file/kitozoveliteguk.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/161076282d35c1---96355301010.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/fuxafibejir.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606df34b1f502---44623226297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gallo+anatomia+patologica+pdfPDF 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 18044 bytes
SHA-256: 0037a76c413808e50f851cad3015f5b556f5430f240bdfc339e94fa4d8be0f3c
font_01_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3E 10600 bytes
SHA-256: aadb5baf73355bd0ab0e6a2b8b6469abd0c6a5416dbf2ccb27691fd0d7454d79

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