Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa408860484362c…

MALICIOUS

PDF

84.3 KB Created: 2021-07-27 22:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d13dc5de0a6b19e7864693f47bfc4dbc SHA-1: a1a6793487c6c30613b220c56cb4393d3bbf0ffb SHA-256: 0fa408860484362c42a4c4ae7660e1969262820eb52c92b1673200da5fec148d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to these compromised sites, potentially for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02bd89237---94674976595.pdf In PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/722abe9946cbb0346a76695a4126a55e/61421496028.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d35599f67---ponen.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/wuxirobig.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/13613313782.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8d55deabb90bec8f10f43bedc64cc0ca/17581936831.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/sodebasivarik.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/sanize.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac93cb4fbe---felixifiji.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2a425c69d33af2b96cc74a0dd11a185a/buboxow.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/mulovugabim.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/10379123772.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/fapapeleramekozovamefap.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/sapasezezekuvaxoremudi.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/dokaji.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6aecda1be---377514047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+use+a+ryobi+multi+toolPDF 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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 10596 bytes
SHA-256: 30d04fff758344d26c4967f2a46cf0e847e459bdb362634a1f216f84e33998d8
font_02_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 17496 bytes
SHA-256: ff486d3c8ccb707ba8b5d19bb7648dbfe7146efa466106c49778d798ec959f4d

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