Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b2a754421dedb4…

MALICIOUS

PDF

94.3 KB Created: 2021-09-06 16:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdebc5fa2afdc29ef6a500262ddd7ee0 SHA-1: e2f7c00a727f8b152487e1d29d86ea5cb95f0733 SHA-256: 13b2a754421dedb4bfe53fa0215824398cd19c72ac3bb8b1e6d01bd9a9cc8668
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document likely instructs the user to copy and paste content into a command-line interface, such as PowerShell or cmd.exe, to execute a payload. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/pemujol.pdf In PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/35vghmmibo3m5lh8re04klqfge/zubokufekiwumotedem.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/22885024523.pdfIn PDF document text
    • https://susta.vn/userfiles/file/31573355517.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/89937397102.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/95727146711.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/59302852003.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/58190563348.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/82ke9jr0oto5t8m5cj0ms63v2v/88142099680.pdfIn PDF document text
    • https://isleo.com/i_photos/file/tatamago.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kanulaxuripamefobi.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5f5eb2230634ba78c774831b95e88c4b/26432918741.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ecd0fe025b65d4db864cf6e1cf26fe2d/88378626068.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e10895a36e9---ronukuveverido.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/s6v4i4al0lj2vrekng1o02em1s/48375565088.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/47341863072.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/62524236482.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/puwedodirukusiximibopuxep.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/bujitu.pdfIn PDF document text
    • https://zzwgjx.com/d/files/sorofezeviwoge.pdfIn PDF document text
    • http://dobermanncz.eu/files/lipowifuwidinupufezip.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/onfhdk4nkptv01p42o29c6jsl7/45501137942.pdfIn PDF document text
    • http://ashioke.com/images/library/File/110011381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mac+os+x+convert+docx+to+pdfPDF 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_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 17476 bytes
SHA-256: b47374fca2f698ce688a80faa3e6aa07dfc049da4c2cafdf9c51ddf5f153f60d
font_02_sfnt_off000152a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A5 10636 bytes
SHA-256: ef7cb83cc95950e148af1bd4b9d50dea83117a90d308e59415c29d7413c66fba

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