Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a6acf317f6260e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-23 22:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ddb95d4f0cfdf8dab9019e419ed1063 SHA-1: e5d88a54d7472dc256e6d7255c77d2d47a85297c SHA-256: 91a6acf317f6260ef4b892141677fc4653cfb48242e5bedf0c3231717f742845
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a lure to execute commands via the clipboard, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. This suggests an attempt to trick the user into running malicious code. The presence of numerous unknown URLs, many pointing to WordPress uploads, indicates a potential link farm or distribution mechanism for further payloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/41982afe07effec69568e8162d01411b/63481566467.pdf In PDF document text
    • http://zjbfjt.com/upload/files/94366842787.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/66604844031.pdfIn PDF document text
    • http://halanmilk.com/upload/files/papawakapavemedatuxire.pdfIn PDF document text
    • https://el-tall.pl/pics/file/35066318199.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/59086820988.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/46001191609.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/89314199453.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/84570511555.pdfIn PDF document text
    • http://potya.com/76160335426.pdfIn PDF document text
    • https://blokhol.com/upload/files/sudamapixumube.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/zipafalimulape.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d834b611a1fe7f3429828ead7bd639ce/wizuzupuse.pdfIn PDF document text
    • http://aurora-c.jp/files/files/72973188590.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/15493976304.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2044a81e40a3c4e23f9dc2d9929eca0b/31519827885.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/tapadukawulij.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/88503721477.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/bitubug.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/zodawibufevalabowonamoxug.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/loxobipapopa.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142086141cb8---jidenum.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/73024955769.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/detexobudaronof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+add+album+art+to+mp3+androidPDF 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_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 10740 bytes
SHA-256: 3204193a72896a47638880668e8e0acd1abc9098ade6fcca34ee2381255a12ab
font_02_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 17944 bytes
SHA-256: 17bcebb0e99295e61957eb2c09931ac43c5dac1e18dc012ba4e3527f7595faf9

Open this report in the interactive analyzer, or submit your own file for analysis.