Malicious PDF — malware analysis report

Static analysis result for SHA-256 3810ee5927785d5d…

MALICIOUS

PDF

79.1 KB Created: 2021-07-17 06:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 74f689f5530ebc489592543215e6cc56 SHA-1: 062c3532359189998606025832ba91a6f000c0cb SHA-256: 3810ee5927785d5d08d9eec9786894ef5f5efc92b05274e7d5e077d61a053c86
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains associated with compromised CMS uploads or are hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the nature of the embedded links suggests a malicious intent to redirect users to potentially harmful content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://advance-pack.com/editor_upload/file/bagepuwumewesovudesaj.pdf In PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/21731595000.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf51a9a8ca4---jigipas.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/kezudeselajejipa.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/mivafejuxedenafavej.pdfIn PDF document text
    • http://yilip.net/userData/board/file/28419282562.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eff866eae7---7058560916.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/70285567263.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/48050001716.pdfIn PDF document text
    • http://prosquash.by/data/juzopejo.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/denifujapobiwafo.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/benubukazajoga.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/i6cpsd809me9hlkpr0p4u3b0r0/meferumerukewi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5323d68d6e---94090422466.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e627ef4fc4b---21926318174.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/60766905323.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5bdb3171c---wazitunaga.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/28206726023.pdfIn PDF document text
    • http://atek-ent.com/upload/file/68720798193.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/wibovukomisudiwux.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b18bb9338---26724036096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+falling+action+of+harrison+bergeronPDF 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_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 10748 bytes
SHA-256: cb05a2f77a44035dd6752b727e955427f849f77f77f0b8e975e9548a411818a1
font_02_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 17196 bytes
SHA-256: 95bd682cb32c6685c4a2f6863c2c0edf411b4a21f52e9a7a48ea0f366c6eb475