Malicious PDF — malware analysis report

Static analysis result for SHA-256 7212bbee40536967…

MALICIOUS

PDF

103.2 KB Created: 2021-07-25 00:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e89df91944d12712ccf1ee63d18969c3 SHA-1: cf6cbaa6650a894b91a2e63e31148cc424fe195a SHA-256: 7212bbee40536967bbd439463ee42530b46b5171447e87a0864a20c114f0b291
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for these links. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the primary attack pattern appears to be a link farm designed to direct users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://aaaxxion.info/images/file/29178417385.pdf In PDF document text
    • http://daehwa.info/uploaded/file/gaziwibatigolabapetozen.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/91528371705.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/puxejar.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/zagudozufopuz.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/fc2991eb9d8c51b86954cb2a0f7c3d42/79784956135.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/tibisuferaporisemitoror.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/muwevateferopevuxobofuxez.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7n1t7he2vtjnge472npdls4lk3/guvuxejibuxipepupurufas.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/a9f8c622aa9dca6bd76f6aaf3827a582/91895692594.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/73911081791d4ec6a571c4301a85d57b/vakesasovimawu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0f7d47b0---domusos.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/171801283.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d64e50c142---1074858599.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/kutel.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/61212035477.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/zorukulotasifitogozet.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9658abeee---jujijavixatuzulutezofojag.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/46967629868.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/kefegano.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab04915b0cc---jijil.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/15410864099.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/62085695792.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/97610524722.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/54806151449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gramatica+a+direct+object+pronouns+answer+key+level+2+pp+41-45PDF 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_off000128ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BE 19348 bytes
SHA-256: 3f495f3e90c74f0b39cb2863e0092651baf9d55a6600dbfb4a66fb4de90d6a80
font_02_sfnt_off0001724f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724F 11860 bytes
SHA-256: ce14ae62a495dbe04aee9f74d5ad79548831b323e7ea8b7fbe36d5b7efde8049