Malicious PDF — malware analysis report

Static analysis result for SHA-256 4720dc9b7e7ca2c6…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 10:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93f4d1bf28fcb755f3b98e9a7f2f4bb4 SHA-1: 2b5847f5c5daeb14244f4b0c70a8a52a8f7f6d2c SHA-256: 4720dc9b7e7ca2c6a6102aa92758e05b26a4c30ba31983855d57a2b9528a6220
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://ekinyalitim.com/depo/sayfaresim/file/43919637619.pdf In PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/64219861387.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/nudaxen.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/jujilipidadejuvages.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/22529756675.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/vuvevid.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/zosafofib.pdfIn PDF document text
    • http://keramann.ru/uploads/files/mexoxexufomurosazox.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/bixufumepaleberijifuxuwas.pdfIn PDF document text
    • https://uangraja.com/contents/files/mukogipevaxosokafisolora.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/tesavazukused.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7cf1f5b2---1106155787.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/55105138418.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/17856641091.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b0960483b27e81d75a81d01f28a8e0da/regagipozajakesab.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/boxoxes.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/62771896018.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/mogamosufiridukufa.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305b5083022---41820623137.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/38700500994.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/bopezizadaja.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6gjmmak8l57g1civlaa47lasqd/wuvulijujizanobefufitope.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/343118901613bb42993eb6.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141df0088e1d---2731204534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=iptv+smarters+pro+apk+latest+versionPDF 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_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 10524 bytes
SHA-256: 1d3a9e8bc70b8f10f82be482ba34c542a38ea0e9d5dc02768ab437a7dae2dc03
font_01_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BB 18184 bytes
SHA-256: e750f1f884e0c02764cb8c1b3296b2bd8d24effd2125305ebcd1c2a7665cd41c

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