Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8469a3c5da8211d…

MALICIOUS

PDF

78.3 KB Created: 2021-08-28 03:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ce5156c522358a1a81006f3affd1511a SHA-1: 030300948d248ebd46785548e390de37e30a9577 SHA-256: e8469a3c5da8211d91c6538d2b39e56d26d9a862f2f4bb66ca1ea5649a2c1dbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://idosekotthonaveresegyhaz.hu/files/files/46670880850.pdf In PDF document text
    • http://texinpack.com/uploadfile/file///2021080407231721.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/xoguxid.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/66090238088.pdfIn PDF document text
    • http://teifsepahan.com/files/file/ralubalenolil.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/21376699276094e9b0a1241.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/xolavobadopivobufudu.pdfIn PDF document text
    • https://wsbtitan.com/images/file/20985273318.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/tatorisonogosowane.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jhijo3d2imediko1r9ds1thbtv/13293625378.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b5e33b416---18590606507.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8ce5422710009f05b5c085e584b0209e/wefevu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160839d5a0d98f---metuwukogomoduvusukudiw.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/51c6b42c03917d6c09c44b7ea62001ae/lajuwupuluxidiwevav.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/bajuripoturawozat.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/47718376975.pdfIn PDF document text
    • https://denimder.org/resimler/files/nedizedaku.pdfIn PDF document text
    • https://bfull.ru/uploads/files/55898601096.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5ebbe34e4---nadutij.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161260c0f3dd10---24952313706.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d69a08a9f---55803780458.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/90221923013.pdfIn PDF document text
    • http://arslanemlak.come/file/kaxuluzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rise+of+cities+and+civilizationsPDF 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_off0000ced0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED0 17052 bytes
SHA-256: 50ec858bb44ce4c76c827b93d1b7c499cf472b38f8f2ec719af42af9a5afad24
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 10540 bytes
SHA-256: c76762c5f5f3d1d5a1f576c73303bb8b805a6df535a375f93625294704aab0ad
font_02_sfnt_off0001135f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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