Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e1c39aa904cb53…

MALICIOUS

PDF

80.0 KB Created: 2021-08-27 19:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0c0f462b9402bbafe2c7e42afc30bd78 SHA-1: 38cce9e88af886581e9dd9f8ed68b2d0c7ac6992 SHA-256: 72e1c39aa904cb5393c2ae86eef1972f31bb58f01e314fc4d5a8672987d9abf7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sacoorhealth.pt/site/upload/file/zitevebonojix.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa29a0765---wokazodibexipip.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/94107589255.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cceaf81a66---44042845964.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/65280328864.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd53676121d---39814661016.pdfIn PDF document text
    • http://palami.by/images/file/37570072875.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/gixev.pdfIn PDF document text
    • https://dafelia.com/files/gusiweruxujuxezosodiwogij.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1841e601c---kekuwiwebegoxigiwo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7581efe9---92975632938.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfff89625ab---46182068436.pdfIn PDF document text
    • https://linardi.ru/files/file/xidipodasaza.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/xamijujabakakenilekomej.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/rekasarekakegumalodedekak.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609f67e94d7a9---ladidelamepuranuboxam.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4771502008.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/namimija.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8q51rntgk12uik7hi8f7i0q223/kakusevobago.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/2e148aac7d6052a4d123fe6ab99efe43/felaperuvub.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/mavesepatowub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbc30a5a11---dofapemilesetevomejov.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/kiweludexukosakujirepupuw.pdfIn PDF document text
    • http://rayanchem.com/d/files/fetumamaxexuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+equinox+of+the+gods+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_off0000d1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 10780 bytes
SHA-256: b666f6fa46db701c4f52bcc358bc1c1a9dc4ce91b93e3920077a469f116efd7d
font_01_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 18412 bytes
SHA-256: e996db0b263ea1b0c087a8e65334b8a36f23586093b5bfb0e1c45d288a220155
font_02_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1