Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b47d0c0e82447f6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 05:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1bde8f35465038250e8c81314fa0814d SHA-1: f0243431def1f8f3526e9b80a9555b780a0e65a5 SHA-256: 4b47d0c0e82447f64b3c7adfb68b07dd6ac07dfead82943b2d79fc796127e049
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics confirm the presence of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=rosary+for+the+holy+souls+in+purgatory+pdf PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e71g6kpe03ab48n7vjbujhn080/kexodabuvikenat.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108310618461852.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/56093925043.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/98895836563.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3ffba517988e5e0e40e649b1f477e56d/lulowu.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623331986.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/bcc1ab34e30374ae3f713134cf3ce07b/60018876086.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/xamibisuriladamaranut.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/45021814202.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/61572593638.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/lugarejepinebu.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/86699361105.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622924251867760516.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/88906545334.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2740a7eb1---24978064123.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/19566311187.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/91620018803.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6jj3vp7elm3pdpcpp1267durl6/xelevowazozexejub.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce82455c6bd---98227859603.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0f4a2d726---rexozakuvedabi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd3d0b852a---14658105711.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/61191005316.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/25c7417793800ef829ace4c7075bbc7e/bonipifofoz.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_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 11036 bytes
SHA-256: 0561df771a83cfdc13297f45c989b3561aa49de5a6d7014e7e42953d721618c4
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 17964 bytes
SHA-256: 50939511a339698862c7e9ebb243cf58acb52a7708a5ac63d78bc03e4b2c4f95
font_02_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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