Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0570e19bb6f9d98…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 16:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fd826edaca1693dcc05bd0e8c6880fc SHA-1: 87ec8c6a96ff775a01f801f79e073b60ddf6bd40 SHA-256: e0570e19bb6f9d981369ed4c9e4fcad59618896aae4f40b7b9cd561e6704bd6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage, likely to obscure the true destination and evade detection. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/321571f0ce1883fb2aa894353b78d42e/54641612658.pdf In PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/82899000321.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0d2d2b8d2---sikijasonuxidifarefirugi.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/fezeduvokos.pdfIn PDF document text
    • http://4bx.pl/public/file/zukewowajudabut.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/88431687804.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/35fo49m0v4vovkqp27klf4pbb9/zixutigidapatapis.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16088692701db1---19301107590.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4529a9316---jaromufuxededefarajuzoris.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/56083425521.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/viwepubiwimisur.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/xejapuxof.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d36259a24---58870851471.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/66636376810.pdfIn PDF document text
    • http://axwelindia.com/uploads/52279057353.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/115b29dc44c45f7a34296103342d8e97/fovise.pdfIn PDF document text
    • http://raczcsalad.hu/files/93194153166.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/bed807d2b5ff574dba69477e1ad29bdb/44207865125.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/64760991409.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ea750a8be386883bbd5c779913aa4514/xakupovipibufevebebusi.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/18454246394.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/kedinifufajetek.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/44740475640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=biochemistry+for+nursing+students+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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 17216 bytes
SHA-256: 73885ec2b1d0ef88618c1d9fa4c55032c04dca12524d1126e9f619356f293fe3
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 11124 bytes
SHA-256: a4ef1a83421c6cc3424190ed9e2e50e87822b42ffd4de42e5556c412fc89f6ee

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