Malicious PDF — malware analysis report

Static analysis result for SHA-256 27db838e1f786373…

MALICIOUS

PDF

77.1 KB Created: 2021-09-02 17:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76308ea45ea0fe03f6cd6489d7d67426 SHA-1: 7af4a9ad91e22e1785f9c0b94982933c145b5aab SHA-256: 27db838e1f7863735663314dbfb0deb3148814f8e66b7098773e36e26189ac5f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs, many hosted on common CMS upload directories, suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://techielingo.com/fck_uploads/files/98292280396.pdf In PDF document text
    • http://arohitourandtravels.com/userfiles/file/55305438169.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/pegasiwigipapimi.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/suzufugerakajomona.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/74348219965.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0082b6e5a7d8cd1a61622a5588f153e3/61099613551.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b5b474776---rudeborafixibe.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d7be4b7eab6---fovutagilejisol.pdfIn PDF document text
    • https://nevisnews.com/userfiles/liwodofofelubusijuda.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/xitoxuvorurizenijije.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/92564064343.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/tajabofasenobabasiru.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/wagepubadomimoxovi.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/rugududuviwolovevanikix.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce70e15589---ronixunugitufosupil.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b543ab95---fonakurafikaxoda.pdfIn PDF document text
    • http://aa-nusd.jp/xizojenirifemasumi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161004fffe4fd3---mubefen.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/dudiropuxisibofogugutazix.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f1df56c41---46482410538.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/35801852611.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/mekiwovuxe.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/bikufurije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=la+county+search+warrant+manualPDF 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_off0000c144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC144 20688 bytes
SHA-256: 67d63e20f63fd57db0c763ee826f7b2de8a877471ca50f4bb7dcc7d7d8700607
font_01_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 10660 bytes
SHA-256: 0cd749593cb5a374eb98f926cab302d597de904ffb8104842898ecf8d2fc62f1

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