Malicious PDF — malware analysis report

Static analysis result for SHA-256 1154307601373d0b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 03:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d42da34490dc16a262ff866b7ed93755 SHA-1: b0a73852e12fb2d523df5ef5580d7aeed7d38818 SHA-256: 1154307601373d0b1c3d932543fe786a56840ded3bc5280f46b46c49572239e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to malicious sites or download further payloads. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=old+house+sketch PDF link annotation
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c2b3099bc8ac271bbde820f5adacc1a0/dabexizadipum.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/gewezopedefabopu.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/38038930735.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97e1e0fe1---47166652130.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160897bc1d0f72---gimiboje.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083818b9db51---88184698250.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/90710641383.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/1fbd37d7c5b26ba34c5bb816e5dcaa10/16713711005.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094724b4b58a---80002230340.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/d06vhu5lu0828scmsemcfmijnv/26170979871.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607246729b0c3---74216978286.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/funetitanus.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/80879398287.pdfIn PDF document text
    • https://biocoils.com/img/file/27086475772.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160dccf4d734cb---duwidexupobuzolu.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/53104978374.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/geravilefesuwapuxixata.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/7li6bqe4j2u1m1f4d8hktq0bv2/levapufudas.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/cf776987db27fa7ddb26bd49718451e9/ruburi.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/45378803896.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/14626568780.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f00f818b6---80475160828.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/6rnhio73qa0n8vptvgdlfcscir/bodewubi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c77610e2229---kodes.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bc7d5a9210---lazafemekir.pdfIn PDF document text
    • 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_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 10224 bytes
SHA-256: 82ad4020dc041678b60e2df702af032d9cb349d33f9873626f3c47fa08f15b04
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 16644 bytes
SHA-256: 6d25ec6aac4833e9f6a1082476bc10e1f7abf8a18d4d14cc9bddb4c4bad9da89