Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc2cf6b75619703…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 03:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78dd9b1322f16b7e3bfae89d44b38a27 SHA-1: fd187bbafa6e820d9f3286a0fdecb658186c445f SHA-256: 6bc2cf6b75619703a288c2b4f13f26292075cac2385b93f530bc02afebb7ae7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, some of which are hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the lure-based attack pattern, likely intended to trick users into downloading a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=cheat+god+eater+burst+ppsspp PDF link annotation
    • http://sushinamu.com/uploads/files/govivof.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161301d1f769b1---49509920797.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/74268973983.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/70113777064.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034d8e968c---48490479882.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/kepufudew.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/wapoguvopiweburaletes.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/xodamoke.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d81de6e85b---88960976140.pdfIn PDF document text
    • http://computerdoki.hu/user/file/42309125284.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/47506050766.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/25646109433.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0ee07d1444a4ab3b80e59652d63261c4/85452617030.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138575c39d1b---9068409374.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/nivizusadofapazojuki.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/lexofisuti.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/89795111657.pdfIn PDF document text
    • https://questyme.com/userfiles/file/55974323651.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/gugokuwisudoxojikej.pdfIn PDF document text
    • https://csodamalom.hu/files/files/zoxulepesilurikepikabez.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/tanadoraxidimeguwimaf.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/pazoxatoguluk.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/47498247417.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/xesalodit.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/vazetewevasipim.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/5548929585.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_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 17996 bytes
SHA-256: 2215c817de59523fd4000c1a17d3130cc37c09878347c9094a73b1735e9d210e
font_02_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 10700 bytes
SHA-256: a98778afbe9a70470e8254dc1c9b22e0ca1dfbfb938aa5cecd0f12ef2dcd1ed9

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