Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4158aa580b64b27…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 07:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 632cad5b98f69d5f06be9f80968bf276 SHA-1: 047a215773e470951c743e84c2a4098cd8cbc3df SHA-256: f4158aa580b64b272b88d90c5609f32f949ff5c30e5ca8d5f7030c036d1f1a73
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, including one pointing to a compromised WordPress site. The ML classifier strongly indicates maliciousness. The presence of a link farm on disposable hosting and the embedded JavaScript suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18a0408f94---topisilukoxatipudobali.pdf In PDF document text
    • https://sportcity.bg/webroot/img/content/files/44932271222.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/gibewiko.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/81036239443.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/2658292568.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/werede.pdfIn PDF document text
    • http://kelvista.lt/images/files/tefajidireruvot.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/dogaziw.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adeddc0e8c9---ditopobolarobotinud.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/i1himhphab2uc3q905tuikk8pb/xodokadanir.pdfIn PDF document text
    • https://room12shio4.com/contents//files/medexonikejujebixe.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/rilij.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1ede01fbf30368fcd46389d4b2e9d52c/67463701147.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/61476660083.pdfIn PDF document text
    • http://co-mit.com/uploads/files/47534781404.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611d09b82d8d3---48359101289.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/70567223837.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080454a0781e---2671568427.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/57c25ef1f985cbce9ed3236b07dac4fa/12495051851.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/jaxoletin.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/3pambm0ieldg46vqbcvlsn0sqc/kavonijozitamibovora.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/lhuf1dacjlksiktdc6v3k7gvl7/vifakisududubinokuwas.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4e33ef3f---xobewebawur.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/48090722605.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/pexopubalikufitakag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+modding+with+forge+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_off0000caf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 10932 bytes
SHA-256: bb53f964976bd5454f47637f1bb79c06a8a1a2c2b256db0415fe2f2b50e5dc3d
font_02_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 17300 bytes
SHA-256: 5f485ddb283dfa148ce7e69707616531f9b2e5ce578fce99ac24f66c8352297f

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