Malicious PDF — malware analysis report

Static analysis result for SHA-256 1806eec789be4c89…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 06:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd29c0b751b6f520aa0d6f0d6cbf650b SHA-1: a189de31fd9bc51bc55afe6310aa122b0cd0678e SHA-256: 1806eec789be4c8948f8a69e9cb9eab2790cbc8cf0944352e85d6a82447768cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://wastran.ru/uplcv?utm_term=samuel+t+gladding+counseling+a+comprehensive+profession+pdf PDF link annotation
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/agbb2q55nh8tcc65eocdcpcanb/vulavirixe.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/memesokiwini.pdfIn PDF document text
    • http://teresachild.com/upload/files/sarudutulitu.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/74140986024.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/45577157350.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160851ec01e757---wagonobizejulibepanilikom.pdfIn PDF document text
    • http://usmleworkout.com/files/file/51702113702.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ccfe9d133---91436284375.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/79672990149.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/272018558412.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/81280508680.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/fuvapu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/403d617b1fcb03fc0bbdc814d2f2ddd9/fabijava.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/80506277569.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wubalebik.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/8btiq77ktp76p1vv6qjcqnav62/mexirevuxefifu.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/85364702951.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01b71f38b---36759289060.pdfIn PDF document text
    • https://akemi.ro/hirek/file/binaninixuve.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160766f137c252---walikitigulilumol.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d8ba34f0c80655f1b5d88b3112cae46f/61252508406.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610b606895051---70366336420.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/petigixe.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/8362912160ee0540aa770.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/24593731555.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086053cba6e1---tanumibezalirom.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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 11308 bytes
SHA-256: a56594f2a7c725d9d2b1d2147e7277ae48eca0f99e8eb5389e6634962ce3a9f3
font_01_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16792 bytes
SHA-256: a35409a8fd7fc04cc86f886c31ea4012593dd002c9ae7e4a4c1f2310afecb9bf
font_02_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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