Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff1e1f611cbac45…

MALICIOUS

PDF

81.3 KB Created: 2021-10-09 06:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 49420c9a6a7bad0cc8a975addd79d4d6 SHA-1: fd1ccc90c127726b8cc4b29b850da8b033ac2f0c SHA-256: 7ff1e1f611cbac455efb9bf135ac5bbdf2e465007cc5eb33de65c5ded5a92f8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a0d29c22---71168317937.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615be3a7cdb6b---wexozusu.pdfIn PDF document text
    • http://leguido.net/files/banukoginedako.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/64723674933.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/58727734531.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/votimemono.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/xuzatilod.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/67729040462.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/48333835518.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff54d11d59---22132494878.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/pijetamewozekiluloxevini.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/24969866960.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/89846558327.pdfIn PDF document text
    • https://diagoldjewels.com/userfiles/file/38738877129.pdfIn PDF document text
    • http://mama.plovdivweek.com/js/ckfinder/userfiles/files/mobejutilo.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/patedufodapatidi.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/kuburanuf.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/26052873306.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/firupotedazoz.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/10472266369.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/92203413505.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/tejaxanavirokugigimezaja.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630997360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+no+glue+slime+with+dish+soapPDF 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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 17792 bytes
SHA-256: e18c91a1cd483f883fff04cea1d198a2dff928fb452f49abff17132912924a4d
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 11008 bytes
SHA-256: 5337d1c40589cb7d49643686d44e55a04ea69986795415bc986280f3e77aa997

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