Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce73305c8ba967e…

MALICIOUS

PDF

95.2 KB Created: 2021-09-17 23:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b951ff1b6b961bb51bf8c6e42258973 SHA-1: 867679da16dd3d1b1a178b3f2ba3315c3bcef0aa SHA-256: 7ce73305c8ba967e15aa145f666ba80b48ba01d6538375c8aa141632abe8e2fa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous URLs suggest an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=batman+the+killing+joke+pdf PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305dd7f383b---94955408764.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/66796610018.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/75605673858.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f58db728---pofoxutonisegelo.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/wovuzim.pdfIn PDF document text
    • http://eva.am/files/614c81610a4c0406.pdfIn PDF document text
    • https://wita.lt/images/files/14463464874.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210909_055655.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/62264302381.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/xipijafuwob.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/witavi.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/buraxomibowewudopev.pdfIn PDF document text
    • http://zgic.ru/!upload/files/61946436459.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613698507d0c2---rusurazidafevi.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/gudepadefato.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/gipodekujabijewewitaji.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/vuzuzixorelasal.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109091405026756.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/92962520593.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/96915368355.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/47133132211.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/jikotap.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/revuf.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d05a02259b---38131230632.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/98649182022.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_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 10952 bytes
SHA-256: 41b15b70604ab6291d7401531a1c4889893597fd06ccfcfa6d95d600cca0f81a
font_01_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14050 18036 bytes
SHA-256: 2a8a12ddc289f70093a420fafa2679c8be263cdb5d4407d45e97c50d3ead831c